mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-21 01:00:48 +00:00
122 lines
2.3 KiB
Markdown
122 lines
2.3 KiB
Markdown
---
|
|
slug: /en/sql-reference/statements/drop
|
|
sidebar_position: 44
|
|
sidebar_label: DROP
|
|
---
|
|
|
|
# DROP Statements
|
|
|
|
Deletes existing entity. If the `IF EXISTS` clause is specified, these queries do not return an error if the entity does not exist. If the `SYNC` modifier is specified, the entity is dropped without delay.
|
|
|
|
## DROP DATABASE
|
|
|
|
Deletes all tables inside the `db` database, then deletes the `db` database itself.
|
|
|
|
Syntax:
|
|
|
|
``` sql
|
|
DROP DATABASE [IF EXISTS] db [ON CLUSTER cluster] [SYNC]
|
|
```
|
|
|
|
## DROP TABLE
|
|
|
|
Deletes the table.
|
|
|
|
:::tip
|
|
Also see [UNDROP TABLE](/docs/en/sql-reference/statements/undrop.md)
|
|
:::
|
|
|
|
Syntax:
|
|
|
|
``` sql
|
|
DROP [TEMPORARY] TABLE [IF EXISTS] [db.]name [ON CLUSTER cluster] [SYNC]
|
|
```
|
|
|
|
## DROP DICTIONARY
|
|
|
|
Deletes the dictionary.
|
|
|
|
Syntax:
|
|
|
|
``` sql
|
|
DROP DICTIONARY [IF EXISTS] [db.]name [SYNC]
|
|
```
|
|
|
|
## DROP USER
|
|
|
|
Deletes a user.
|
|
|
|
Syntax:
|
|
|
|
``` sql
|
|
DROP USER [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
|
|
```
|
|
|
|
## DROP ROLE
|
|
|
|
Deletes a role. The deleted role is revoked from all the entities where it was assigned.
|
|
|
|
Syntax:
|
|
|
|
``` sql
|
|
DROP ROLE [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
|
|
```
|
|
|
|
## DROP ROW POLICY
|
|
|
|
Deletes a row policy. Deleted row policy is revoked from all the entities where it was assigned.
|
|
|
|
Syntax:
|
|
|
|
``` sql
|
|
DROP [ROW] POLICY [IF EXISTS] name [,...] ON [database.]table [,...] [ON CLUSTER cluster_name]
|
|
```
|
|
|
|
## DROP QUOTA
|
|
|
|
Deletes a quota. The deleted quota is revoked from all the entities where it was assigned.
|
|
|
|
Syntax:
|
|
|
|
``` sql
|
|
DROP QUOTA [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
|
|
```
|
|
|
|
## DROP SETTINGS PROFILE
|
|
|
|
Deletes a settings profile. The deleted settings profile is revoked from all the entities where it was assigned.
|
|
|
|
Syntax:
|
|
|
|
``` sql
|
|
DROP [SETTINGS] PROFILE [IF EXISTS] name [,...] [ON CLUSTER cluster_name]
|
|
```
|
|
|
|
## DROP VIEW
|
|
|
|
Deletes a view. Views can be deleted by a `DROP TABLE` command as well but `DROP VIEW` checks that `[db.]name` is a view.
|
|
|
|
Syntax:
|
|
|
|
``` sql
|
|
DROP VIEW [IF EXISTS] [db.]name [ON CLUSTER cluster] [SYNC]
|
|
```
|
|
|
|
## DROP FUNCTION
|
|
|
|
Deletes a user defined function created by [CREATE FUNCTION](./create/function.md).
|
|
System functions can not be dropped.
|
|
|
|
**Syntax**
|
|
|
|
``` sql
|
|
DROP FUNCTION [IF EXISTS] function_name [on CLUSTER cluster]
|
|
```
|
|
|
|
**Example**
|
|
|
|
``` sql
|
|
CREATE FUNCTION linear_equation AS (x, k, b) -> k*x + b;
|
|
DROP FUNCTION linear_equation;
|
|
```
|