Grant command is often used to giving user access rights or permission to perform operations on the database objects.
GRANT <privilege_name> ON object_name TO <username>;
GRANT ALL ON Student TO xyz;
Revoke command is often used to remove assigned user access permission or privileges.
REVOKE <privilege_name> ON object_name TO <username>;
REVOKE ALL ON Student FROM xyz;
I hope this bit of information is helpful to you
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