SQL DCL Operations

USING DCL

DCL commands are used to granting and revoking the permissions.

USING GRANT

This is used to grant the privileges to other users.

Syntax:

     Grant <privileges> on <object_name> to <user_name> [with grant option];

Ex:

     SQL> grant select on student to sudha;         -- you can give individual privilege

      SQL> grant select, insert on student to sudha;       -- you can give set of privileges

     SQL> grant all on student to sudha;                -- you can give all privileges

   

     The sudha user has to use dot method to access the object.

     SQL> select * from saketh.student;

     The sudha user can not grant permission on student table to other users. To get this type of option use the following.

     SQL> grant all on student to sudha with grant option;  

          

     Now sudha user also grant permissions on student table.

USING REVOKE

This is used to revoke the privileges from the users to which you granted the privileges.

Syntax:

     Revoke <privileges> on <object_name> from <user_name>;

Ex:

     SQL> revoke select on student form sudha; -- you can revoke individual privilege

     SQL> revoke select, insert on student from sudha;            -- you can revoke set of privileges

      SQL> revoke all on student from sudha;       -- you can revoke all privileges