- sidebar_label: DROP
- DROP语法 {#drop}
- DROP DATABASE {#drop-database}
- DROP TABLE {#drop-table}
- DROP DICTIONARY {#drop-dictionary}
- DROP USER {#drop-user-statement}
- DROP ROLE {#drop-role-statement}
- DROP ROW POLICY {#drop-row-policy-statement}
- DROP QUOTA {#drop-quota-statement}
- DROP SETTINGS PROFILE {#drop-settings-profile-statement}
- DROP VIEW {#drop-view}
slug: /zh/sql-reference/statements/drop sidebar_position: 44
sidebar_label: DROP
DROP语法 {#drop}
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。
DROP DATABASE {#drop-database}
删除db
数据库中的所有表,然后删除db
数据库本身。
语法:
DROP DATABASE [IF EXISTS] db [ON CLUSTER cluster]
DROP TABLE {#drop-table}
删除数据表
语法:
DROP [TEMPORARY] TABLE [IF EXISTS] [db.]name [ON CLUSTER cluster]
DROP DICTIONARY {#drop-dictionary}
删除字典。
语法:
DROP DICTIONARY [IF EXISTS] [db.]name
DROP USER {#drop-user-statement}
删除用户.
语法:
DROP USER [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
DROP ROLE {#drop-role-statement}
删除角色。删除的角色将从分配给它的所有实体中撤消。
语法:
DROP ROLE [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
DROP ROW POLICY {#drop-row-policy-statement}
删除行策略。 删除的行策略从分配到它的所有实体中撤消。
语法:
DROP [ROW] POLICY [IF EXISTS] name [,...] ON [database.]table [,...] [ON CLUSTER cluster_name]
DROP QUOTA {#drop-quota-statement}
Deletes a quota. The deleted quota is revoked from all the entities where it was assigned.
语法:
DROP QUOTA [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
DROP SETTINGS PROFILE {#drop-settings-profile-statement}
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。
语法:
DROP [SETTINGS] PROFILE [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
DROP VIEW {#drop-view}
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。
语法:
DROP VIEW [IF EXISTS] [db.]name [ON CLUSTER cluster]