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49 lines
1.6 KiB
Markdown
49 lines
1.6 KiB
Markdown
---
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sidebar_position: 39
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sidebar_label: REVOKE
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---
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# REVOKE Statement
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Revokes privileges from users or roles.
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## Syntax
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**Revoking privileges from users**
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``` sql
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REVOKE [ON CLUSTER cluster_name] privilege[(column_name [,...])] [,...] ON {db.table|db.*|*.*|table|*} FROM {user | CURRENT_USER} [,...] | ALL | ALL EXCEPT {user | CURRENT_USER} [,...]
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```
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**Revoking roles from users**
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``` sql
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REVOKE [ON CLUSTER cluster_name] [ADMIN OPTION FOR] role [,...] FROM {user | role | CURRENT_USER} [,...] | ALL | ALL EXCEPT {user_name | role_name | CURRENT_USER} [,...]
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```
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## Description
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To revoke some privilege you can use a privilege of a wider scope than you plan to revoke. For example, if a user has the `SELECT (x,y)` privilege, administrator can execute `REVOKE SELECT(x,y) ...`, or `REVOKE SELECT * ...`, or even `REVOKE ALL PRIVILEGES ...` query to revoke this privilege.
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### Partial Revokes
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You can revoke a part of a privilege. For example, if a user has the `SELECT *.*` privilege you can revoke from it a privilege to read data from some table or a database.
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## Examples
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Grant the `john` user account with a privilege to select from all the databases, excepting the `accounts` one:
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``` sql
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GRANT SELECT ON *.* TO john;
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REVOKE SELECT ON accounts.* FROM john;
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```
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Grant the `mira` user account with a privilege to select from all the columns of the `accounts.staff` table, excepting the `wage` one.
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``` sql
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GRANT SELECT ON accounts.staff TO mira;
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REVOKE SELECT(wage) ON accounts.staff FROM mira;
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```
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[Original article](https://clickhouse.com/docs/en/operations/settings/settings/)
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