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101 lines
1.9 KiB
Markdown
101 lines
1.9 KiB
Markdown
---
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toc_priority: 44
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toc_title: DROP
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---
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# DROP语法 {#drop}
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删除现有实体。 如果指定了`IF EXISTS`子句,如果实体不存在,这些查询不会返回错误。
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## DROP DATABASE {#drop-database}
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删除`db`数据库中的所有表,然后删除`db`数据库本身。
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语法:
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``` sql
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DROP DATABASE [IF EXISTS] db [ON CLUSTER cluster]
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```
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## DROP TABLE {#drop-table}
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删除数据表
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语法:
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``` sql
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DROP [TEMPORARY] TABLE [IF EXISTS] [db.]name [ON CLUSTER cluster]
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```
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## DROP DICTIONARY {#drop-dictionary}
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删除字典。
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语法:
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``` sql
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DROP DICTIONARY [IF EXISTS] [db.]name
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```
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## DROP USER {#drop-user-statement}
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删除用户.
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语法:
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``` sql
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DROP USER [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
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```
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## DROP ROLE {#drop-role-statement}
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删除角色。删除的角色将从分配给它的所有实体中撤消。
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语法:
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``` sql
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DROP ROLE [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
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```
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## DROP ROW POLICY {#drop-row-policy-statement}
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删除行策略。 删除的行策略从分配到它的所有实体中撤消。
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语法:
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``` sql
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DROP [ROW] POLICY [IF EXISTS] name [,...] ON [database.]table [,...] [ON CLUSTER cluster_name]
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```
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## DROP QUOTA {#drop-quota-statement}
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Deletes a quota. The deleted quota is revoked from all the entities where it was assigned.
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语法:
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``` sql
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DROP QUOTA [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
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```
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## DROP SETTINGS PROFILE {#drop-settings-profile-statement}
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删除配置文件。 已删除的设置配置文件将从分配给它的所有实体中撤销。
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语法:
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``` sql
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DROP [SETTINGS] PROFILE [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
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```
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## DROP VIEW {#drop-view}
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删除视图。 视图也可以通过`DROP TABLE`命令删除,但`DROP VIEW`会检查`[db.]name`是否是一个视图。
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语法:
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``` sql
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DROP VIEW [IF EXISTS] [db.]name [ON CLUSTER cluster]
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```
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[原始文章](https://clickhouse.com/docs/zh/sql-reference/statements/drop/) <!--hide-->
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