ClickHouse/docs/zh/sql-reference/statements/drop.md
2021-08-27 19:32:21 +08:00

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---
toc_priority: 44
toc_title: 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:
``` sql
DROP DATABASE [IF EXISTS] db [ON CLUSTER cluster]
```
## DROP TABLE {#drop-table}
删除数据表
语法:
``` sql
DROP [TEMPORARY] TABLE [IF EXISTS] [db.]name [ON CLUSTER cluster]
```
## DROP DICTIONARY {#drop-dictionary}
删除字典。
语法:
``` sql
DROP DICTIONARY [IF EXISTS] [db.]name
```
## DROP USER {#drop-user-statement}
删除用户.
语法:
``` sql
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:
``` sql
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:
``` sql
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:
``` sql
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:
``` sql
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:
``` sql
DROP VIEW [IF EXISTS] [db.]name [ON CLUSTER cluster]
```
[原始文章](https://clickhouse.tech/docs/zh/sql-reference/statements/drop/) <!--hide-->