{"Entry":{"collection":"sql","key":"drop-domain","name":"DROP DOMAIN","aliases":["dropdomain"],"metadata":{"aliases":["dropdomain"],"changed_in":["7.4","8.2"],"changes":[{"from":"7.2","purpose_changed":false,"renamed":null,"sections":{"added":[],"changed":[],"removed":[]},"status":"added","synopsis":null,"to":"7.3"},{"from":"7.3","purpose_changed":true,"renamed":null,"sections":{"added":["parameters"],"changed":["description","examples","compatibility"],"removed":[]},"status":"changed","synopsis":{"added":["DROP DOMAIN name [, ...]  [ CASCADE | RESTRICT ]"],"removed":["DROP DOMAIN domainname [, ...]  [ CASCADE | RESTRICT ]"]},"to":"7.4"},{"from":"8.0","purpose_changed":false,"renamed":null,"sections":{"added":[],"changed":["see_also"],"removed":[]},"status":"changed","synopsis":null,"to":"8.1"},{"from":"8.1","purpose_changed":false,"renamed":null,"sections":{"added":[],"changed":["parameters","compatibility"],"removed":[]},"status":"changed","synopsis":{"added":["DROP DOMAIN [IF EXISTS ] name [, ...]  [ CASCADE | RESTRICT ]"],"removed":[]},"to":"8.2"},{"from":"8.2","purpose_changed":false,"renamed":null,"sections":{"added":[],"changed":["description"],"removed":[]},"status":"changed","synopsis":null,"to":"8.3"},{"from":"9.5","purpose_changed":false,"renamed":null,"sections":{"added":[],"changed":["parameters"],"removed":[]},"status":"changed","synopsis":null,"to":"9.6"},{"from":"11","purpose_changed":false,"renamed":null,"sections":{"added":[],"changed":["parameters"],"removed":[]},"status":"changed","synopsis":null,"to":"12"},{"from":"16","purpose_changed":false,"renamed":null,"sections":{"added":[],"changed":["parameters"],"removed":[]},"status":"changed","synopsis":null,"to":"17"},{"from":"18","purpose_changed":false,"renamed":null,"sections":{"added":[],"changed":["parameters"],"removed":[]},"status":"changed","synopsis":null,"to":"19"}],"content_hash":"e9ceb6a4d916ea40414c9e6dbf70cce7467fcb63bac27aa4e37abd30d140f81f","editorial":{},"first_version":"7.3","group":"type","imported_at":"2026-09-30T17:43:37.486879+08:00","last_version":"20","name":"DROP DOMAIN","object":"DOMAIN","position":3010,"present_in":["7.3","7.4","8.0","8.1","8.2","8.3","8.4","9.0","9.1","9.2","9.3","9.4","9.5","9.6","10","11","12","13","14","15","16","17","18","19","20"],"purpose":"remove a domain","purpose_zh":"","related":["create-domain","alter-domain"],"slug":"drop-domain","source_rev":"a709ab85","synopsis":"DROP DOMAIN [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]","verb":"DROP"}},"Definition":{"Collection":"sql","Key":"drop-domain","SourceDatabase":"center","Version":"18","SourceTable":"sqlcmd","SourceKey":"drop-domain","SourceRevision":"a709ab85","Facts":{"anchor":"SQL-DROPDOMAIN","file":"sql-dropdomain.html","lang":"en","name":"DROP DOMAIN","purpose":"remove a domain","purpose_zh":"","related":["create-domain","alter-domain"],"sections":[{"html":"\u003cp\u003e\u003ccode class=\"command\"\u003eDROP DOMAIN\u003c/code\u003e removes a domain. Only the owner of a domain can remove it.\u003c/p\u003e","key":"description","title":"Description"},{"html":"\u003cdiv class=\"variablelist\"\u003e\u003cdl class=\"variablelist\"\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003e\u003ccode class=\"literal\"\u003eIF EXISTS\u003c/code\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003eDo not throw an error if the domain does not exist. A notice is issued in this case.\u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003e\u003cem class=\"replaceable\"\u003e\u003ccode\u003ename\u003c/code\u003e\u003c/em\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003eThe name (optionally schema-qualified) of an existing domain.\u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003e\u003ccode class=\"literal\"\u003eCASCADE\u003c/code\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003eAutomatically drop objects that depend on the domain (such as table columns), and in turn all objects that depend on those objects (see \u003ca href=\"/docs/18/ddl-depend.html\" title=\"5.15. Dependency Tracking\"\u003eSection 5.15\u003c/a\u003e).\u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003e\u003ccode class=\"literal\"\u003eRESTRICT\u003c/code\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003eRefuse to drop the domain if any objects depend on it. This is the default.\u003c/p\u003e\u003c/dd\u003e\u003c/dl\u003e\u003c/div\u003e","key":"parameters","title":"Parameters"},{"html":"\u003cp\u003eTo remove the domain \u003ccode class=\"type\"\u003ebox\u003c/code\u003e:\u003c/p\u003e\u003cpre class=\"programlisting\"\u003eDROP DOMAIN box;\n\u003c/pre\u003e","key":"examples","title":"Examples"},{"html":"\u003cp\u003eThis command conforms to the SQL standard, except for the \u003ccode class=\"literal\"\u003eIF EXISTS\u003c/code\u003e option, which is a \u003cspan class=\"productname\"\u003ePostgreSQL\u003c/span\u003e extension.\u003c/p\u003e","key":"compatibility","title":"Compatibility"},{"html":"\u003cspan class=\"simplelist\"\u003e\u003ca href=\"/wiki/sql/create-domain/?v=18\" title=\"CREATE DOMAIN\"\u003e\u003cspan class=\"refentrytitle\"\u003eCREATE DOMAIN\u003c/span\u003e\u003c/a\u003e, \u003ca href=\"/wiki/sql/alter-domain/?v=18\" title=\"ALTER DOMAIN\"\u003e\u003cspan class=\"refentrytitle\"\u003eALTER DOMAIN\u003c/span\u003e\u003c/a\u003e\u003c/span\u003e","key":"see_also","title":"See Also"}],"sections_same_as":"","slug":"18","synopsis_html":"DROP DOMAIN [ IF EXISTS ] \u003cem class=\"replaceable\"\u003e\u003ccode\u003ename\u003c/code\u003e\u003c/em\u003e [, ...] [ CASCADE | RESTRICT ]","synopsis_text":"DROP DOMAIN [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]"},"ManualEvidence":{},"MeasuredEvidence":{}},"Text":{"Collection":"sql","Key":"drop-domain","SourceDatabase":"pgweb","Version":"18","Locale":"zh-Hans","Title":"DROP DOMAIN","Summary":"移除一个域","BodyHTML":"\u003cpre\u003eDROP DOMAIN [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]\u003c/pre\u003e\u003csection\u003e\u003ch2\u003e描述\u003c/h2\u003e\u003cp\u003e\u003ccode\u003eDROP DOMAIN\u003c/code\u003e移除一个域。只有域的拥有者才能移除它。\u003c/p\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003e参数\u003c/h2\u003e\u003cdiv\u003e\u003cdl\u003e\u003cdt\u003e\u003cspan\u003e\u003ccode\u003eIF EXISTS\u003c/code\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003e如果该域不存在，则不会抛出错误，而是发出一条提示。\u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan\u003e\u003cem\u003e\u003ccode\u003ename\u003c/code\u003e\u003c/em\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003e要移除的现有域的名称（可以是模式限定的）。\u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan\u003e\u003ccode\u003eCASCADE\u003c/code\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003e自动删除依赖于该域的对象（例如表列），以及进一步依赖于这些对象的所有对象（参见\u003ca href=\"/docs/18/ddl-depend.html\" rel=\"nofollow\"\u003e第 5.15 节\u003c/a\u003e）。\u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan\u003e\u003ccode\u003eRESTRICT\u003c/code\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003e如果有任何对象依赖于该域，则拒绝删除它。这是默认值。\u003c/p\u003e\u003c/dd\u003e\u003c/dl\u003e\u003c/div\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003e示例\u003c/h2\u003e\u003cp\u003e要移除域\u003ccode\u003ebox\u003c/code\u003e：\u003c/p\u003e\u003cpre\u003eDROP DOMAIN box;\n\u003c/pre\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003e兼容性\u003c/h2\u003e\u003cp\u003e此命令符合 SQL 标准，但\u003ccode\u003eIF EXISTS\u003c/code\u003e选项是 \u003cspan\u003ePostgreSQL\u003c/span\u003e扩展。\u003c/p\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003e另见\u003c/h2\u003e\u003cspan\u003e\u003ca href=\"/wiki/sql/create-domain/?v=18\" title=\"CREATE DOMAIN\" rel=\"nofollow\"\u003e\u003cspan\u003eCREATE DOMAIN\u003c/span\u003e\u003c/a\u003e, \u003ca href=\"/wiki/sql/alter-domain/?v=18\" title=\"ALTER DOMAIN\" rel=\"nofollow\"\u003e\u003cspan\u003eALTER DOMAIN\u003c/span\u003e\u003c/a\u003e\u003c/span\u003e\u003c/section\u003e","SourceRevision":"1b5ca64c","ContentHash":"ca02faa377856b712f0463308b9c9513dfeba005b5d30f5cfcfab75445e9d633","Payload":{"purpose_zh":"移除一个域","sections":[{"html":"\u003cp\u003e\u003ccode class=\"command\"\u003eDROP DOMAIN\u003c/code\u003e移除一个域。只有域的拥有者才能移除它。\u003c/p\u003e","key":"description","title":"描述"},{"html":"\u003cdiv class=\"variablelist\"\u003e\u003cdl class=\"variablelist\"\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003e\u003ccode class=\"literal\"\u003eIF EXISTS\u003c/code\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003e如果该域不存在，则不会抛出错误，而是发出一条提示。\u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003e\u003cem class=\"replaceable\"\u003e\u003ccode\u003ename\u003c/code\u003e\u003c/em\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003e要移除的现有域的名称（可以是模式限定的）。\u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003e\u003ccode class=\"literal\"\u003eCASCADE\u003c/code\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003e自动删除依赖于该域的对象（例如表列），以及进一步依赖于这些对象的所有对象（参见\u003ca href=\"/docs/18/ddl-depend.html\" title=\"5.15. 依赖跟踪\"\u003e第 5.15 节\u003c/a\u003e）。\u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003e\u003ccode class=\"literal\"\u003eRESTRICT\u003c/code\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003e如果有任何对象依赖于该域，则拒绝删除它。这是默认值。\u003c/p\u003e\u003c/dd\u003e\u003c/dl\u003e\u003c/div\u003e","key":"parameters","title":"参数"},{"html":"\u003cp\u003e要移除域\u003ccode class=\"type\"\u003ebox\u003c/code\u003e：\u003c/p\u003e\u003cpre class=\"programlisting\"\u003eDROP DOMAIN box;\n\u003c/pre\u003e","key":"examples","title":"示例"},{"html":"\u003cp\u003e此命令符合 SQL 标准，但\u003ccode class=\"literal\"\u003eIF EXISTS\u003c/code\u003e选项是 \u003cspan class=\"productname\"\u003ePostgreSQL\u003c/span\u003e扩展。\u003c/p\u003e","key":"compatibility","title":"兼容性"},{"html":"\u003cspan class=\"simplelist\"\u003e\u003ca href=\"/wiki/sql/create-domain/?v=18\" title=\"CREATE DOMAIN\"\u003e\u003cspan class=\"refentrytitle\"\u003eCREATE DOMAIN\u003c/span\u003e\u003c/a\u003e, \u003ca href=\"/wiki/sql/alter-domain/?v=18\" title=\"ALTER DOMAIN\"\u003e\u003cspan class=\"refentrytitle\"\u003eALTER DOMAIN\u003c/span\u003e\u003c/a\u003e\u003c/span\u003e","key":"see_also","title":"另见"}],"sections_same_as":"","synopsis_html":"DROP DOMAIN [ IF EXISTS ] \u003cem class=\"replaceable\"\u003e\u003ccode\u003ename\u003c/code\u003e\u003c/em\u003e [, ...] [ CASCADE | RESTRICT ]","synopsis_text":"DROP DOMAIN [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]"}},"RequestedLocale":"zh-Hans","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20","7.3","7.4","8.0","8.1","8.2","8.3","8.4","9.0","9.1","9.2","9.3","9.4","9.5","9.6"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}