{"Entry":{"collection":"type","key":"anyrange","name":"anyrange","aliases":[],"metadata":{"aliases":[],"category":"Pseudo-types","content_hash":"a93294dc4a35b6363b2e69842ecabeffa013c4f8b6e86ef2035b7269866e8987","imported_at":"2026-09-30T00:40:35.408598+08:00","name":"anyrange","name_zh":"","slug":"anyrange","summary":"Indicates that a function accepts any range data type (see Section 36.2.5 and Section 8.17 )."}},"Definition":{"Collection":"type","Key":"anyrange","SourceDatabase":"center","Version":"18","SourceTable":"data_type","SourceKey":"anyrange","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","Facts":{"aliases":[],"casts":[],"catalog":{"array_type_name":"","array_type_oid":"0","descr":"pseudo-type representing a range over a polymorphic base type","oid":"3831","typacl":"_null_","typalign":"d","typanalyze":"-","typarray":"0","typbasetype":"0","typbyval":"f","typcategory":"P","typcollation":"0","typdefault":"_null_","typdefaultbin":"_null_","typdelim":"','","typelem":"0","typinput":"anyrange_in","typisdefined":"t","typispreferred":"f","typlen":"-1","typmodin":"-","typmodout":"-","typname":"anyrange","typnamespace":"pg_catalog","typndims":"0","typnotnull":"f","typoutput":"anyrange_out","typowner":"POSTGRES","typreceive":"-","typrelid":"0","typsend":"-","typstorage":"x","typsubscript":"-","typtype":"p","typtypmod":"-1"},"comparison_data":{"aliases":[],"casts":[],"catalog":{"array_type_name":"","typacl":"_null_","typalign":"d","typanalyze":"-","typarray":"","typbasetype":"0","typbyval":"f","typcategory":"P","typcollation":"0","typdefault":"_null_","typdefaultbin":"_null_","typdelim":",","typelem":"0","typinput":"anyrange_in","typisdefined":"t","typispreferred":"f","typlen":"-1","typmodin":"-","typmodout":"-","typname":"anyrange","typndims":"0","typnotnull":"f","typoutput":"anyrange_out","typreceive":"-","typrelid":"0","typsend":"-","typstorage":"x","typsubscript":"-","typtype":"p","typtypmod":"-1"},"facts":[{"label":"Catalog name","value":"pg_catalog.anyrange"},{"label":"Declared length","value":"Variable length (varlena)"},{"label":"Documented declaration","value":"anyrange"},{"label":"Input function","value":"anyrange_in"},{"label":"Output function","value":"anyrange_out"},{"label":"Storage strategy","value":"extended"},{"label":"Type OID","value":"3831"},{"label":"Type kind","value":"Pseudo-type"}],"operator_classes":[{"opcdefault":"t","opcfamily":"brin/range_inclusion_ops","opcintype":"anyrange","opckeytype":"anyrange","opcmethod":"brin","opcname":"range_inclusion_ops"},{"opcdefault":"t","opcfamily":"btree/range_ops","opcintype":"anyrange","opckeytype":"0","opcmethod":"btree","opcname":"range_ops"},{"opcdefault":"t","opcfamily":"gist/range_ops","opcintype":"anyrange","opckeytype":"0","opcmethod":"gist","opcname":"range_ops"},{"opcdefault":"t","opcfamily":"hash/range_ops","opcintype":"anyrange","opckeytype":"0","opcmethod":"hash","opcname":"range_ops"},{"opcdefault":"t","opcfamily":"spgist/range_ops","opcintype":"anyrange","opckeytype":"0","opcmethod":"spgist","opcname":"range_ops"}],"operators":[{"oprcanhash":"f","oprcanmerge":"f","oprcode":"elem_contained_by_range","oprcom":"@\u003e(anyrange,anyelement)","oprjoin":"contjoinsel","oprkind":"b","oprleft":"anyelement","oprname":"\u003c@","oprnegate":"0","oprrest":"rangesel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"multirange_adjacent_range","oprcom":"-|-(anyrange,anymultirange)","oprjoin":"matchingjoinsel","oprkind":"b","oprleft":"anymultirange","oprname":"-|-","oprnegate":"0","oprrest":"matchingsel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"multirange_after_range","oprcom":"\u003c\u003c(anyrange,anymultirange)","oprjoin":"scalargtjoinsel","oprkind":"b","oprleft":"anymultirange","oprname":"\u003e\u003e","oprnegate":"0","oprrest":"multirangesel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"multirange_before_range","oprcom":"\u003e\u003e(anyrange,anymultirange)","oprjoin":"scalarltjoinsel","oprkind":"b","oprleft":"anymultirange","oprname":"\u003c\u003c","oprnegate":"0","oprrest":"multirangesel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"multirange_contained_by_range","oprcom":"@\u003e(anyrange,anymultirange)","oprjoin":"contjoinsel","oprkind":"b","oprleft":"anymultirange","oprname":"\u003c@","oprnegate":"0","oprrest":"multirangesel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"multirange_contains_range","oprcom":"\u003c@(anyrange,anymultirange)","oprjoin":"contjoinsel","oprkind":"b","oprleft":"anymultirange","oprname":"@\u003e","oprnegate":"0","oprrest":"multirangesel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"multirange_overlaps_range","oprcom":"\u0026\u0026(anyrange,anymultirange)","oprjoin":"areajoinsel","oprkind":"b","oprleft":"anymultirange","oprname":"\u0026\u0026","oprnegate":"0","oprrest":"multirangesel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"multirange_overleft_range","oprcom":"0","oprjoin":"scalarltjoinsel","oprkind":"b","oprleft":"anymultirange","oprname":"\u0026\u003c","oprnegate":"0","oprrest":"multirangesel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"multirange_overright_range","oprcom":"0","oprjoin":"scalargtjoinsel","oprkind":"b","oprleft":"anymultirange","oprname":"\u0026\u003e","oprnegate":"0","oprrest":"multirangesel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"range_adjacent","oprcom":"-|-(anyrange,anyrange)","oprjoin":"matchingjoinsel","oprkind":"b","oprleft":"anyrange","oprname":"-|-","oprnegate":"0","oprrest":"matchingsel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"range_adjacent_multirange","oprcom":"-|-(anymultirange,anyrange)","oprjoin":"matchingjoinsel","oprkind":"b","oprleft":"anyrange","oprname":"-|-","oprnegate":"0","oprrest":"matchingsel","oprresult":"bool","oprright":"anymultirange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"range_after","oprcom":"\u003c\u003c(anyrange,anyrange)","oprjoin":"scalargtjoinsel","oprkind":"b","oprleft":"anyrange","oprname":"\u003e\u003e","oprnegate":"0","oprrest":"rangesel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"range_after_multirange","oprcom":"\u003c\u003c(anymultirange,anyrange)","oprjoin":"scalargtjoinsel","oprkind":"b","oprleft":"anyrange","oprname":"\u003e\u003e","oprnegate":"0","oprrest":"multirangesel","oprresult":"bool","oprright":"anymultirange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"range_before","oprcom":"\u003e\u003e(anyrange,anyrange)","oprjoin":"scalarltjoinsel","oprkind":"b","oprleft":"anyrange","oprname":"\u003c\u003c","oprnegate":"0","oprrest":"rangesel","oprresult":"bool","oprright":"anyrange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode":"range_before_multirange","oprcom":"\u003e\u003e(anymultirange,anyrange)","oprjoin":"scalarltjoinsel","oprkind":"b","oprleft":"anyrange","oprname":"\u003c\u003c","oprnegate":"0","oprrest":"multirangesel","oprresult":"bool","oprright":"anymultirange"},{"oprcanhash":"f","oprcanmerge":"f","oprcode"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inventory; exact declared input types for operator classes","description":["Indicates that a function accepts any range data type (see Section 36.2.5 and Section 8.17 )."],"facts":[{"label":"Catalog name","value":"pg_catalog.anyrange"},{"label":"Type OID","value":"3831"},{"label":"Type kind","value":"Pseudo-type"},{"label":"Declared length","value":"Variable length (varlena)"},{"label":"Storage strategy","value":"extended"},{"label":"Input function","value":"anyrange_in"},{"label":"Output function","value":"anyrange_out"},{"label":"Documented declaration","value":"anyrange"},{"label":"Manual description","value":"Indicates that a function accepts any range data type (see Section 36.2.5 and Section 8.17 )."}],"manual_documentation":"dedicated family chapter","manual_html":"\u003cdiv class=\"sect1\" id=\"DATATYPE-PSEUDO\"\u003e\n\u003cdiv class=\"titlepage\"\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ch2 class=\"title\"\u003e8.21. Pseudo-Types \u003c/h2\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cp\u003eThe \u003cspan class=\"productname\"\u003ePostgreSQL\u003c/span\u003e type system contains a number of special-purpose entries that are collectively called \u003cem class=\"firstterm\"\u003epseudo-types\u003c/em\u003e. A pseudo-type cannot be used as a column data type, but it can be used to declare a function's argument or result type. Each of the available pseudo-types is useful in situations where a function's behavior does not correspond to simply taking or returning a value of a specific SQL data type. \u003ca class=\"xref\" href=\"/docs/18/datatype-pseudo.html#DATATYPE-PSEUDOTYPES-TABLE\" title=\"Table 8.27. Pseudo-Types\"\u003eTable 8.27\u003c/a\u003e lists the existing pseudo-types.\u003c/p\u003e\n\u003cdiv class=\"table\" id=\"DATATYPE-PSEUDOTYPES-TABLE\"\u003e\n\u003cp class=\"title\"\u003e\u003cstrong\u003eTable 8.27. Pseudo-Types\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"table-contents\"\u003e\n\u003ctable class=\"table\"\u003e\n\n\n\n\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eName\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eany\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any input data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyelement\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanynonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyenum\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any enum data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/datatype-enum.html\" title=\"8.7. Enumerated Types\"\u003eSection 8.7\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyrange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanymultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatible\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblearray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblenonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblerange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblemultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003ecstring\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a null-terminated C string.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003einternal\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a server-internal data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003elanguage_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA procedural language call handler is declared to return \u003ccode class=\"type\"\u003elanguage_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003efdw_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA foreign-data wrapper handler is declared to return \u003ccode class=\"type\"\u003efdw_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etable_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA table access method handler is declared to return \u003ccode class=\"type\"\u003etable_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eindex_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn index access method handler is declared to return \u003ccode class=\"type\"\u003eindex_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etsm_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA tablesample method handler is declared to return \u003ccode class=\"type\"\u003etsm_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003erecord\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a function taking or returning an unspecified row type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etrigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA trigger function is declared to return \u003ccode class=\"type\"\u003etrigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eevent_trigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn event trigger function is declared to return \u003ccode class=\"type\"\u003eevent_trigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003epg_ddl_command\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a representation of DDL commands that is available to event triggers.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003evoid\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function returns no value.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eunknown\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a not-yet-resolved type, e.g., of an undecorated string literal.\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003c/div\u003e\n\u003c/div\u003e\u003cbr class=\"table-break\"\u003e\n\u003cp\u003eFunctions coded in C (whether built-in or dynamically loaded) can be declared to accept or return any of these pseudo-types. It is up to the function author to ensure that the function will behave safely when a pseudo-type is used as an argument type.\u003c/p\u003e\n\u003cp\u003eFunctions coded in procedural languages can use pseudo-types only as allowed by their implementation languages. At present most procedural languages forbid use of a pseudo-type as an argument type, and allow only \u003ccode class=\"type\"\u003evoid\u003c/code\u003e and \u003ccode class=\"type\"\u003erecord\u003c/code\u003e as a result type (plus \u003ccode class=\"type\"\u003etrigger\u003c/code\u003e or \u003ccode class=\"type\"\u003eevent_trigger\u003c/code\u003e when the function is used as a trigger or event trigger). Some also support polymorphic functions using the polymorphic pseudo-types, which are shown above and discussed in detail in \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e.\u003c/p\u003e\n\u003cp\u003eThe \u003ccode class=\"type\"\u003einternal\u003c/code\u003e pseudo-type is used to declare functions that are meant only to be called internally by the database system, and not by direct invocation in an SQL query. If a function has at least one \u003ccode class=\"type\"\u003einternal\u003c/code\u003e-type argument then it cannot be called from SQL. To preserve the type safety of this restriction it is important to follow this coding rule: do not create any function that is declared to return \u003ccode class=\"type\"\u003einternal\u003c/code\u003e unless it has at least one \u003ccode class=\"type\"\u003einternal\u003c/code\u003e argument.\u003c/p\u003e\n\u003c/div\u003e","manual_path":"datatype-pseudo.html","operator_classes":[{"opcdefault":"t","opcfamily":"btree/range_ops","opcintype":"anyrange","opckeytype":"0","opcmethod":"btree","opcname":"range_ops","opcnamespace":"pg_catalog","opcowner":"POSTGRES"},{"opcdefault":"t","opcfamily":"hash/range_ops","opcintype":"anyrange","opckeytype":"0","opcmethod":"hash","opcname":"range_ops","opcnamespace":"pg_catalog","opcowner":"POSTGRES"},{"opcdefault":"t","opcfamily":"gist/range_ops","opcintype":"anyrange","opckeytype":"0","opcmethod":"gist","opcname":"range_ops","opcnamespace":"pg_catalog","opcowner":"POSTGRES"},{"opcdefault":"t","opcfamily":"spgist/range_ops","opcintype":"anyrange","opckeytype":"0","opcmethod":"spgist","opcname":"range_ops","opcnamespace":"pg_catalog","opcowner":"POSTGRES"},{"opcdefault":"t","opcfamily":"brin/range_inclusion_ops","opcintype":"anyrange","opckeytype":"anyrange","opcmethod":"brin","opcname":"range_inclusion_ops","opcnamespace":"pg_catalog","opcowner":"POSTGRES"}],"operators":[{"descr":"equal","oid":"3882","oid_symbol":"RANGE_EQ_OP","oprcanhash":"t","oprcanmerge":"t","oprcode":"range_eq","oprcom":"=(anyrange,anyrange)","oprjoin":"eqjoinsel","oprkind":"b","oprleft":"anyrange","oprname":"=","oprnamespace":"pg_catalog","oprnegate":"\u003c\u003e(anyrange,anyrange)","oprowner":"POSTGRES","oprrest":"eqsel","oprresult":"bool","oprright":"anyrange"},{"descr":"not 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A pseudo-type cannot be used as a column data type, but it can be used to declare a function\u0026#39;s argument or result type. Each of the available pseudo-types is useful in situations where a function\u0026#39;s behavior does not correspond to simply taking or returning a value of a specific SQL data type. \u003ca href=\"/docs/18/datatype-pseudo.html#DATATYPE-PSEUDOTYPES-TABLE\" rel=\"nofollow\"\u003eTable 8.27\u003c/a\u003e lists the existing pseudo-types.\u003c/p\u003e\n\u003cdiv id=\"DATATYPE-PSEUDOTYPES-TABLE\"\u003e\n\u003cp\u003e\u003cstrong\u003eTable 8.27. Pseudo-Types\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv\u003e\n\u003ctable\u003e\n\n\n\n\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eName\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eany\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any input data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanyelement\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanyarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanynonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanyenum\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any enum data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca href=\"/docs/18/datatype-enum.html\" rel=\"nofollow\"\u003eSection 8.7\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanyrange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca href=\"/docs/18/rangetypes.html\" rel=\"nofollow\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanymultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca href=\"/docs/18/rangetypes.html\" rel=\"nofollow\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanycompatible\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type, with automatic promotion of multiple arguments to a common data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanycompatiblearray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanycompatiblenonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanycompatiblerange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type, with automatic promotion of multiple arguments to a common data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca href=\"/docs/18/rangetypes.html\" rel=\"nofollow\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanycompatiblemultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type, with automatic promotion of multiple arguments to a common data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca href=\"/docs/18/rangetypes.html\" rel=\"nofollow\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003ecstring\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a null-terminated C string.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003einternal\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a server-internal data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003elanguage_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA procedural language call handler is declared to return \u003ccode\u003elanguage_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003efdw_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA foreign-data wrapper handler is declared to return \u003ccode\u003efdw_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003etable_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA table access method handler is declared to return \u003ccode\u003etable_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eindex_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn index access method handler is declared to return \u003ccode\u003eindex_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003etsm_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA tablesample method handler is declared to return \u003ccode\u003etsm_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003erecord\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a function taking or returning an unspecified row type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003etrigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA trigger function is declared to return \u003ccode\u003etrigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eevent_trigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn event trigger function is declared to return \u003ccode\u003eevent_trigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003epg_ddl_command\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a representation of DDL commands that is available to event triggers.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003evoid\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function returns no value.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eunknown\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a not-yet-resolved type, e.g., of an undecorated string literal.\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003c/div\u003e\n\u003c/div\u003e\u003cbr\u003e\n\u003cp\u003eFunctions coded in C (whether built-in or dynamically loaded) can be declared to accept or return any of these pseudo-types. It is up to the function author to ensure that the function will behave safely when a pseudo-type is used as an argument type.\u003c/p\u003e\n\u003cp\u003eFunctions coded in procedural languages can use pseudo-types only as allowed by their implementation languages. At present most procedural languages forbid use of a pseudo-type as an argument type, and allow only \u003ccode\u003evoid\u003c/code\u003e and \u003ccode\u003erecord\u003c/code\u003e as a result type (plus \u003ccode\u003etrigger\u003c/code\u003e or \u003ccode\u003eevent_trigger\u003c/code\u003e when the function is used as a trigger or event trigger). Some also support polymorphic functions using the polymorphic pseudo-types, which are shown above and discussed in detail in \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e.\u003c/p\u003e\n\u003cp\u003eThe \u003ccode\u003einternal\u003c/code\u003e pseudo-type is used to declare functions that are meant only to be called internally by the database system, and not by direct invocation in an SQL query. If a function has at least one \u003ccode\u003einternal\u003c/code\u003e-type argument then it cannot be called from SQL. To preserve the type safety of this restriction it is important to follow this coding rule: do not create any function that is declared to return \u003ccode\u003einternal\u003c/code\u003e unless it has at least one \u003ccode\u003einternal\u003c/code\u003e argument.\u003c/p\u003e\n\u003c/div\u003e","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","ContentHash":"55bf8f3b07aa5bceaf4f3149d27e6e629561763a635a12ac37eed4b5d825598e","Payload":{"description":["Indicates that a function accepts any range data type (see Section 36.2.5 and Section 8.17 )."],"manual_html":"\u003cdiv class=\"sect1\" id=\"DATATYPE-PSEUDO\"\u003e\n\u003cdiv class=\"titlepage\"\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ch2 class=\"title\"\u003e8.21. Pseudo-Types \u003c/h2\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cp\u003eThe \u003cspan class=\"productname\"\u003ePostgreSQL\u003c/span\u003e type system contains a number of special-purpose entries that are collectively called \u003cem class=\"firstterm\"\u003epseudo-types\u003c/em\u003e. A pseudo-type cannot be used as a column data type, but it can be used to declare a function's argument or result type. Each of the available pseudo-types is useful in situations where a function's behavior does not correspond to simply taking or returning a value of a specific SQL data type. \u003ca class=\"xref\" href=\"/docs/18/datatype-pseudo.html#DATATYPE-PSEUDOTYPES-TABLE\" title=\"Table 8.27. Pseudo-Types\"\u003eTable 8.27\u003c/a\u003e lists the existing pseudo-types.\u003c/p\u003e\n\u003cdiv class=\"table\" id=\"DATATYPE-PSEUDOTYPES-TABLE\"\u003e\n\u003cp class=\"title\"\u003e\u003cstrong\u003eTable 8.27. Pseudo-Types\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"table-contents\"\u003e\n\u003ctable class=\"table\"\u003e\n\n\n\n\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eName\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eany\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any input data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyelement\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanynonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyenum\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any enum data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/datatype-enum.html\" title=\"8.7. Enumerated Types\"\u003eSection 8.7\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyrange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanymultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatible\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblearray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblenonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblerange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblemultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003ecstring\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a null-terminated C string.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003einternal\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a server-internal data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003elanguage_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA procedural language call handler is declared to return \u003ccode class=\"type\"\u003elanguage_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003efdw_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA foreign-data wrapper handler is declared to return \u003ccode class=\"type\"\u003efdw_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etable_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA table access method handler is declared to return \u003ccode class=\"type\"\u003etable_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eindex_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn index access method handler is declared to return \u003ccode class=\"type\"\u003eindex_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etsm_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA tablesample method handler is declared to return \u003ccode class=\"type\"\u003etsm_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003erecord\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a function taking or returning an unspecified row type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etrigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA trigger function is declared to return \u003ccode class=\"type\"\u003etrigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eevent_trigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn event trigger function is declared to return \u003ccode class=\"type\"\u003eevent_trigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003epg_ddl_command\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a representation of DDL commands that is available to event triggers.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003evoid\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function returns no value.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eunknown\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a not-yet-resolved type, e.g., of an undecorated string literal.\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003c/div\u003e\n\u003c/div\u003e\u003cbr class=\"table-break\"\u003e\n\u003cp\u003eFunctions coded in C (whether built-in or dynamically loaded) can be declared to accept or return any of these pseudo-types. It is up to the function author to ensure that the function will behave safely when a pseudo-type is used as an argument type.\u003c/p\u003e\n\u003cp\u003eFunctions coded in procedural languages can use pseudo-types only as allowed by their implementation languages. At present most procedural languages forbid use of a pseudo-type as an argument type, and allow only \u003ccode class=\"type\"\u003evoid\u003c/code\u003e and \u003ccode class=\"type\"\u003erecord\u003c/code\u003e as a result type (plus \u003ccode class=\"type\"\u003etrigger\u003c/code\u003e or \u003ccode class=\"type\"\u003eevent_trigger\u003c/code\u003e when the function is used as a trigger or event trigger). Some also support polymorphic functions using the polymorphic pseudo-types, which are shown above and discussed in detail in \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e.\u003c/p\u003e\n\u003cp\u003eThe \u003ccode class=\"type\"\u003einternal\u003c/code\u003e pseudo-type is used to declare functions that are meant only to be called internally by the database system, and not by direct invocation in an SQL query. If a function has at least one \u003ccode class=\"type\"\u003einternal\u003c/code\u003e-type argument then it cannot be called from SQL. To preserve the type safety of this restriction it is important to follow this coding rule: do not create any function that is declared to return \u003ccode class=\"type\"\u003einternal\u003c/code\u003e unless it has at least one \u003ccode class=\"type\"\u003einternal\u003c/code\u003e argument.\u003c/p\u003e\n\u003c/div\u003e","related":[{"label":"pg_type catalog","url":"/wiki/catalog/pg_type/?v=18"},{"label":"pg_cast catalog","url":"/wiki/catalog/pg_cast/?v=18"},{"label":"pg_operator catalog","url":"/wiki/catalog/pg_operator/?v=18"},{"label":"pg_opclass catalog","url":"/wiki/catalog/pg_opclass/?v=18"},{"label":"Arrays","url":"/wiki/type/arrays/?v=18"},{"label":"brin index access method","url":"/wiki/indexam/brin/?v=18"},{"label":"btree index access method","url":"/wiki/indexam/btree/?v=18"},{"label":"gist index access method","url":"/wiki/indexam/gist/?v=18"},{"label":"hash index access method","url":"/wiki/indexam/hash/?v=18"},{"label":"spgist index access method","url":"/wiki/indexam/spgist/?v=18"}],"sections":[]}},"RequestedLocale":"zh-Hans","Fallback":true,"Versions":["10","11","12","13","14","15","16","17","18","19","20"],"Locales":["en"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}