mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-13 02:53:38 +00:00
50 lines
1.6 KiB
Markdown
50 lines
1.6 KiB
Markdown
---
|
|
slug: /en/sql-reference/statements/revoke
|
|
sidebar_position: 39
|
|
sidebar_label: REVOKE
|
|
---
|
|
|
|
# REVOKE Statement
|
|
|
|
Revokes privileges from users or roles.
|
|
|
|
## Syntax
|
|
|
|
**Revoking privileges from users**
|
|
|
|
``` sql
|
|
REVOKE [ON CLUSTER cluster_name] privilege[(column_name [,...])] [,...] ON {db.table|db.*|*.*|table|*} FROM {user | CURRENT_USER} [,...] | ALL | ALL EXCEPT {user | CURRENT_USER} [,...]
|
|
```
|
|
|
|
**Revoking roles from users**
|
|
|
|
``` sql
|
|
REVOKE [ON CLUSTER cluster_name] [ADMIN OPTION FOR] role [,...] FROM {user | role | CURRENT_USER} [,...] | ALL | ALL EXCEPT {user_name | role_name | CURRENT_USER} [,...]
|
|
```
|
|
|
|
## Description
|
|
|
|
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.
|
|
|
|
### Partial Revokes
|
|
|
|
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.
|
|
|
|
## Examples
|
|
|
|
Grant the `john` user account with a privilege to select from all the databases, excepting the `accounts` one:
|
|
|
|
``` sql
|
|
GRANT SELECT ON *.* TO john;
|
|
REVOKE SELECT ON accounts.* FROM john;
|
|
```
|
|
|
|
Grant the `mira` user account with a privilege to select from all the columns of the `accounts.staff` table, excepting the `wage` one.
|
|
|
|
``` sql
|
|
GRANT SELECT ON accounts.staff TO mira;
|
|
REVOKE SELECT(wage) ON accounts.staff FROM mira;
|
|
```
|
|
|
|
[Original article](https://clickhouse.com/docs/en/operations/settings/settings/)
|