{"Entry":{"collection":"sql","key":"drop-table","name":"DROP TABLE","aliases":["droptable"],"metadata":{"aliases":["droptable"],"changed_in":["6.5","7.3","8.2"],"changes":[{"from":"6.4","purpose_changed":false,"renamed":null,"sections":{"added":[],"changed":["usage"],"removed":[]},"status":"changed","synopsis":{"added":["DROP TABLE name [, ...]"],"removed":["DROP TABLE table [, ...]"]},"to":"6.5"},{"from":"7.0","purpose_changed":false,"renamed":{"from_file":"sql-droptable.htm","to_file":"sql-droptable.html"},"sections":{"added":[],"changed":["description"],"removed":[]},"status":"changed","synopsis":null,"to":"7.1"},{"from":"7.1","purpose_changed":true,"renamed":null,"sections":{"added":[],"changed":[],"removed":[]},"status":"changed","synopsis":null,"to":"7.2"},{"from":"7.2","purpose_changed":false,"renamed":null,"sections":{"added":[],"changed":["description","compatibility"],"removed":[]},"status":"changed","synopsis":{"added":["DROP TABLE name [, ...] [ CASCADE | RESTRICT 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TABLE","object":"TABLE","position":10,"present_in":["6.4","6.5","7.0","7.1","7.2","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 table","purpose_zh":"","related":["alter-table","create-table"],"repair_provenance":{"original_source_revision":"wiki-repair-20261023:51ca470b31784ae33a129a27c64d51936d1965ef0a45aa30f6c26702be8b14f6","receipt_sha256":"464f6f0e55f72b45a3a6523c087ccefb6fee764c4016d5899137dd82c61b8206","repair":"wiki-repair-20261023"},"slug":"drop-table","source_rev":"wiki-repair-20261023:11591e658214eb92b0244395b1d23a998c5370998f79b8c555d5dfc142ae6a26","synopsis":"DROP TABLE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]","verb":"DROP"}},"Definition":{"Collection":"sql","Key":"drop-table","SourceDatabase":"center","Version":"18","SourceTable":"sqlcmd","SourceKey":"drop-table","SourceRevision":"wiki-repair-20261023:11591e658214eb92b0244395b1d23a998c5370998f79b8c555d5dfc142ae6a26","Facts":{"anchor":"SQL-DROPTABLE","description_zh":"移除一个表","description_zh_html":"\u003cpre\u003eDROP TABLE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]\u003c/pre\u003e\u003csection\u003e\u003ch2\u003e描述\u003c/h2\u003e\u003cp\u003e\n\u003ccode class=\"command\"\u003eDROP TABLE\u003c/code\u003e 从数据库中移除表。只有表拥有者、模式拥有者以及超级用户才能删除表。若要清空表中的行而不销毁该表，请使用\n   \u003ca class=\"link\" href=\"/zh/docs/18/sql-delete.html\" title=\"DELETE\"\u003e\u003ccode class=\"command\"\u003eDELETE\u003c/code\u003e\u003c/a\u003e 或\n   \u003ca class=\"link\" href=\"/zh/docs/18/sql-truncate.html\" title=\"TRUNCATE\"\u003e\u003ccode class=\"command\"\u003eTRUNCATE\u003c/code\u003e\u003c/a\u003e。\n  \u003c/p\u003e\u003cp\u003e\n\u003ccode class=\"command\"\u003eDROP TABLE\u003c/code\u003e 总会移除目标表上存在的所有索引、规则、触发器和约束。但是，要删除一个被视图或另一张表的外键约束引用的表，必须指定 \u003ccode class=\"literal\"\u003eCASCADE\u003c/code\u003e。（\u003ccode class=\"literal\"\u003eCASCADE\u003c/code\u003e 会将依赖于该表的视图整个删除，但在外键场景下，它只会删除外键约束，不会把另一张表整体删除。）\n  \u003c/p\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003e参数\u003c/h2\u003e\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\n      如果表不存在，则不要抛出错误。这种情况下会发出一条提示。\n     \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\n      要删除的表名称（可选地使用模式限定）。\n     \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\n      自动删除依赖于该表的对象（例如视图），以及进一步依赖于这些对象的所有对象（参见\u003ca class=\"xref\" href=\"/zh/docs/18/ddl-depend.html\" title=\"5.15. 依赖跟踪\"\u003e第 5.15 节\u003c/a\u003e）。\n     \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\n      如果有任何对象依赖于该表，则拒绝删除它。这是默认值。\n     \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\n   要删除两个表 \u003ccode class=\"literal\"\u003efilms\u003c/code\u003e 和 \u003ccode class=\"literal\"\u003edistributors\u003c/code\u003e：\n\n\u003c/p\u003e\u003cpre class=\"programlisting\"\u003e\nDROP TABLE films, distributors;\n\u003c/pre\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003e兼容性\u003c/h2\u003e\u003cp\u003e\n   此命令符合 SQL 标准，只是标准每条命令只允许删除一个表，且 \u003ccode class=\"literal\"\u003eIF EXISTS\u003c/code\u003e 选项是 \u003cspan class=\"productname\"\u003ePostgreSQL\u003c/span\u003e 扩展。\n  \u003c/p\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003e另见\u003c/h2\u003e\u003cspan class=\"simplelist\"\u003e\u003ca class=\"xref\" href=\"/zh/docs/18/sql-altertable.html\" title=\"ALTER TABLE\"\u003e\u003cspan class=\"refentrytitle\"\u003eALTER TABLE\u003c/span\u003e\u003c/a\u003e, \u003ca class=\"xref\" href=\"/zh/docs/18/sql-createtable.html\" title=\"CREATE TABLE\"\u003e\u003cspan class=\"refentrytitle\"\u003eCREATE TABLE\u003c/span\u003e\u003c/a\u003e\u003c/span\u003e\u003c/section\u003e","file":"sql-droptable.html","lang":"en","name":"DROP TABLE","purpose":"remove a table","purpose_zh":"移除一个表","related":["alter-table","create-table"],"sections":[{"html":"\u003cp\u003e\u003ccode class=\"command\"\u003eDROP TABLE\u003c/code\u003e removes tables from the database. Only the table owner, the schema owner, and superuser can drop a table. To empty a table of rows without destroying the table, use \u003ca href=\"/docs/18/sql-delete.html\" title=\"DELETE\"\u003e\u003ccode class=\"command\"\u003eDELETE\u003c/code\u003e\u003c/a\u003e or \u003ca href=\"/docs/18/sql-truncate.html\" title=\"TRUNCATE\"\u003e\u003ccode class=\"command\"\u003eTRUNCATE\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\u003cp\u003e\u003ccode class=\"command\"\u003eDROP TABLE\u003c/code\u003e always removes any indexes, rules, triggers, and constraints that exist for the target table. However, to drop a table that is referenced by a view or a foreign-key constraint of another table, \u003ccode class=\"literal\"\u003eCASCADE\u003c/code\u003e must be specified. (\u003ccode class=\"literal\"\u003eCASCADE\u003c/code\u003e will remove a dependent view entirely, but in the foreign-key case it will only remove the foreign-key constraint, not the other table entirely.)\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 table 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 the table to drop.\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 table (such as views), 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 table 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 destroy two tables, \u003ccode class=\"literal\"\u003efilms\u003c/code\u003e and \u003ccode class=\"literal\"\u003edistributors\u003c/code\u003e:\u003c/p\u003e\u003cpre class=\"programlisting\"\u003eDROP TABLE films, distributors;\n\u003c/pre\u003e","key":"examples","title":"Examples"},{"html":"\u003cp\u003eThis command conforms to the SQL standard, except that the standard only allows one table to be dropped per command, and apart from 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/alter-table/?v=18\" title=\"ALTER TABLE\"\u003e\u003cspan class=\"refentrytitle\"\u003eALTER TABLE\u003c/span\u003e\u003c/a\u003e, \u003ca href=\"/wiki/sql/create-table/?v=18\" title=\"CREATE TABLE\"\u003e\u003cspan class=\"refentrytitle\"\u003eCREATE TABLE\u003c/span\u003e\u003c/a\u003e\u003c/span\u003e","key":"see_also","title":"See Also"}],"sections_same_as":"","slug":"18","synopsis_html":"DROP TABLE [ IF EXISTS ] \u003cem class=\"replaceable\"\u003e\u003ccode\u003ename\u003c/code\u003e\u003c/em\u003e [, ...] [ CASCADE | RESTRICT ]","synopsis_text":"DROP TABLE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]","translation_provenance":{"inputs":[{"kind":"current-pgdoc-translation","path":"/Users/vonng/pgsty/pgdoc/zh/18/html/sql-droptable.html","sha256":"84b7e5c5c32ec1df22817b159f973f167e253c4234a37067b13b2a08a736b1c3"}],"kind":"same-version-pgdoc","locale":"zh-Hans","source_revision":"b1b500221dbe5437cfca004d6b04d3f6e422765d","version":"18"},"zh_from":"same-version-pgdoc"},"ManualEvidence":{},"MeasuredEvidence":{}},"Text":{"Collection":"sql","Key":"drop-table","SourceDatabase":"center","Version":"18","Locale":"en","Title":"DROP TABLE","Summary":"remove a table","BodyHTML":"\u003cpre\u003eDROP TABLE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]\u003c/pre\u003e\u003csection\u003e\u003ch2\u003eDescription\u003c/h2\u003e\u003cp\u003e\u003ccode\u003eDROP TABLE\u003c/code\u003e removes tables from the database. Only the table owner, the schema owner, and superuser can drop a table. To empty a table of rows without destroying the table, use \u003ca href=\"/docs/18/sql-delete.html\" title=\"DELETE\" rel=\"nofollow\"\u003e\u003ccode\u003eDELETE\u003c/code\u003e\u003c/a\u003e or \u003ca href=\"/docs/18/sql-truncate.html\" title=\"TRUNCATE\" rel=\"nofollow\"\u003e\u003ccode\u003eTRUNCATE\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\u003cp\u003e\u003ccode\u003eDROP TABLE\u003c/code\u003e always removes any indexes, rules, triggers, and constraints that exist for the target table. However, to drop a table that is referenced by a view or a foreign-key constraint of another table, \u003ccode\u003eCASCADE\u003c/code\u003e must be specified. (\u003ccode\u003eCASCADE\u003c/code\u003e will remove a dependent view entirely, but in the foreign-key case it will only remove the foreign-key constraint, not the other table entirely.)\u003c/p\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003eParameters\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\u003eDo not throw an error if the table does not exist. A notice is issued in this case.\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\u003eThe name (optionally schema-qualified) of the table to drop.\u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan\u003e\u003ccode\u003eCASCADE\u003c/code\u003e\u003c/span\u003e\u003c/dt\u003e\u003cdd\u003e\u003cp\u003eAutomatically drop objects that depend on the table (such as views), and in turn all objects that depend on those objects (see \u003ca href=\"/docs/18/ddl-depend.html\" rel=\"nofollow\"\u003eSection 5.15\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\u003eRefuse to drop the table if any objects depend on it. This is the default.\u003c/p\u003e\u003c/dd\u003e\u003c/dl\u003e\u003c/div\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003eExamples\u003c/h2\u003e\u003cp\u003eTo destroy two tables, \u003ccode\u003efilms\u003c/code\u003e and \u003ccode\u003edistributors\u003c/code\u003e:\u003c/p\u003e\u003cpre\u003eDROP TABLE films, distributors;\n\u003c/pre\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003eCompatibility\u003c/h2\u003e\u003cp\u003eThis command conforms to the SQL standard, except that the standard only allows one table to be dropped per command, and apart from the \u003ccode\u003eIF EXISTS\u003c/code\u003e option, which is a \u003cspan\u003ePostgreSQL\u003c/span\u003e extension.\u003c/p\u003e\u003c/section\u003e\u003csection\u003e\u003ch2\u003eSee Also\u003c/h2\u003e\u003cspan\u003e\u003ca href=\"/wiki/sql/alter-table/?v=18\" title=\"ALTER TABLE\" rel=\"nofollow\"\u003e\u003cspan\u003eALTER TABLE\u003c/span\u003e\u003c/a\u003e, \u003ca href=\"/wiki/sql/create-table/?v=18\" title=\"CREATE TABLE\" rel=\"nofollow\"\u003e\u003cspan\u003eCREATE TABLE\u003c/span\u003e\u003c/a\u003e\u003c/span\u003e\u003c/section\u003e","SourceRevision":"wiki-repair-20261023:11591e658214eb92b0244395b1d23a998c5370998f79b8c555d5dfc142ae6a26","ContentHash":"c63b469f69bf35d1742c998a4b0dfbca7a51613c6d9bfd7285951b34120faa07","Payload":{"related":["alter-table","create-table"],"sections":[{"html":"\u003cp\u003e\u003ccode class=\"command\"\u003eDROP TABLE\u003c/code\u003e removes tables from the database. Only the table owner, the schema owner, and superuser can drop a table. To empty a table of rows without destroying the table, use \u003ca href=\"/docs/18/sql-delete.html\" title=\"DELETE\"\u003e\u003ccode class=\"command\"\u003eDELETE\u003c/code\u003e\u003c/a\u003e or \u003ca href=\"/docs/18/sql-truncate.html\" title=\"TRUNCATE\"\u003e\u003ccode class=\"command\"\u003eTRUNCATE\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\u003cp\u003e\u003ccode class=\"command\"\u003eDROP TABLE\u003c/code\u003e always removes any indexes, rules, triggers, and constraints that exist for the target table. However, to drop a table that is referenced by a view or a foreign-key constraint of another table, \u003ccode class=\"literal\"\u003eCASCADE\u003c/code\u003e must be specified. (\u003ccode class=\"literal\"\u003eCASCADE\u003c/code\u003e will remove a dependent view entirely, but in the foreign-key case it will only remove the foreign-key constraint, not the other table entirely.)\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 table 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 the table to drop.\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 table (such as views), 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 table 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 destroy two tables, \u003ccode class=\"literal\"\u003efilms\u003c/code\u003e and \u003ccode class=\"literal\"\u003edistributors\u003c/code\u003e:\u003c/p\u003e\u003cpre class=\"programlisting\"\u003eDROP TABLE films, distributors;\n\u003c/pre\u003e","key":"examples","title":"Examples"},{"html":"\u003cp\u003eThis command conforms to the SQL standard, except that the standard only allows one table to be dropped per command, and apart from 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/alter-table/?v=18\" title=\"ALTER TABLE\"\u003e\u003cspan class=\"refentrytitle\"\u003eALTER TABLE\u003c/span\u003e\u003c/a\u003e, \u003ca href=\"/wiki/sql/create-table/?v=18\" title=\"CREATE TABLE\"\u003e\u003cspan class=\"refentrytitle\"\u003eCREATE TABLE\u003c/span\u003e\u003c/a\u003e\u003c/span\u003e","key":"see_also","title":"See Also"}],"sections_same_as":"","synopsis_html":"DROP TABLE [ IF EXISTS ] \u003cem class=\"replaceable\"\u003e\u003ccode\u003ename\u003c/code\u003e\u003c/em\u003e [, ...] [ CASCADE | RESTRICT ]","synopsis_text":"DROP TABLE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]"}},"RequestedLocale":"en","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20","6.4","6.5","7.0","7.1","7.2","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}