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117 lines
2.3 KiB
Markdown
117 lines
2.3 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 Statements {#drop}
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Deletes existing entity. If the `IF EXISTS` clause is specified, these queries do not return an error if the entity does not exist.
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## DROP DATABASE {#drop-database}
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Deletes all tables inside the `db` database, then deletes the `db` database itself.
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Syntax:
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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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Deletes the table.
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Syntax:
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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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Deletes the dictionary.
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Syntax:
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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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Deletes a user.
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Syntax:
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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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Deletes a role. The deleted role is revoked from all the entities where it was assigned.
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Syntax:
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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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Deletes a row policy. Deleted row policy is revoked from all the entities where it was assigned.
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Syntax:
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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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Syntax:
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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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Deletes a settings profile. The deleted settings profile is revoked from all the entities where it was assigned.
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Syntax:
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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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Deletes a view. Views can be deleted by a `DROP TABLE` command as well but `DROP VIEW` checks that `[db.]name` is a view.
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Syntax:
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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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## DROP FUNCTION {#drop-function}
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Deletes a user defined function created by [CREATE FUNCTION](./create/function.md).
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System functions can not be dropped.
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**Syntax**
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``` sql
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DROP FUNCTION [IF EXISTS] function_name
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```
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**Example**
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``` sql
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CREATE FUNCTION linear_equation AS (x, k, b) -> k*x + b;
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DROP FUNCTION linear_equation;
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```
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