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50 lines
1.5 KiB
Markdown
50 lines
1.5 KiB
Markdown
---
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slug: /zh/sql-reference/statements/revoke
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sidebar_position: 40
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sidebar_label: REVOKE
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---
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# 权限取消 {#revoke}
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取消用户或角色的权限
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## 语法 {#revoke-语法}
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**取消用户的权限**
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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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**取消用户的角色**
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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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## 说明 {#revoke-description}
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要取消某些权限,可使用比要撤回的权限更大范围的权限。例如,当用户有 `SELECT (x,y)`权限时,管理员可执行 `REVOKE SELECT(x,y) ...`, 或 `REVOKE SELECT * ...`, 甚至是 `REVOKE ALL PRIVILEGES ...`来取消原有权限。
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### 取消部分权限 {#partial-revokes-dscr}
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可以取消部分权限。例如,当用户有 `SELECT *.*` 权限时,可以通过授予对部分库或表的读取权限来撤回原有权限。
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## 示例 {#revoke-example}
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授权 `john`账号能查询所有库的所有表,除了 `account`库。
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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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授权 `mira`账号能查询 `accounts.staff`表的所有列,除了 `wage`这一列。
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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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{## [原始文档](https://clickhouse.com/docs/en/operations/settings/settings/) ##}
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