What statements are used in sql to revoke data operation permissions from users?
The statement in SQL to revoke data operation permissions is REVOKE, and the syntax is: REVOKE <Permissions> ON <Table name> FROM <User>.
Statement to revoke data operation permissions in SQL
In SQL, by using REVOKE
statement can revoke the user's permission to operate data.
Syntax
<code>REVOKE <权限> ON <表名> FROM <用户></code>
Where:
-
<Permissions>
: The permission to be revoked, which can beSELECT
,INSERT
,UPDATE
,DELETE
or all permissions (ALL
) -
<Table name>
: The name of the table whose permissions are to be revoked -
<User>
: The user whose permissions are to be revoked
Example
For example, to revoke user alice
’s SELECT
permissions on table customers
, you can use the following statement:
<code>REVOKE SELECT ON customers FROM alice;</code>
NOTE
- REVOKE does not delete granted permissions, it only revokes them. If the user subsequently gains permission again, they will be able to access the data again.
- Be careful when using REVOKE as it is a destructive operation that may accidentally restrict user access to data.
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