The SQL REVOKE statement is used to revoke privileges from a user or role. The REVOKE statement is used to undo the privileges granted using the GRANT statement. The basic syntax of the REVOKE statement is as follows:

REVOKE privilege1, privilege2, ...
ON object_type object_name
FROM user_or_role;

Where privilege1, privilege2, … are the privileges you want to revoke, object_type is the type of object the privileges are being revoked from (such as TABLE, VIEW, PROCEDURE, etc.), object_name is the name of the object, and user_or_role is the user or role that the privileges are being revoked from.

Here’s an example of using the REVOKE statement in SQL:

REVOKE SELECT, INSERT, UPDATE
ON employees
FROM user1;

In this example, the SELECT, INSERT, and UPDATE privileges are being revoked from the user1 user for the employees table.

You can also revoke privileges from all objects of a specific type by using the * wildcard character:

REVOKE SELECT
ON TABLE *
FROM user2;

In this example, the SELECT privilege is being revoked from the user2 user for all tables in the database.

In conclusion, the SQL REVOKE statement is used to revoke privileges from a user or role, and its basic syntax is REVOKE privilege1, privilege2, ... ON object_type object_name FROM user_or_role;. The privileges can be revoked from a specific database object or from all objects of a specific type, and can be revoked from a user or role.

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