SQL Data Control Language (DCL) Commands Cheatsheet

GRANT

GRANT <permissions> ON <object> TO <user>;

• Description: Grants specific permissions on a database object (table, view, etc.) to a user or a group.
• Permissions: Examples include SELECT, INSERT, UPDATE, DELETE, ALL PRIVILEGES.
• Example:

  GRANT SELECT, INSERT ON employees TO 'user1';
  

REVOKE

REVOKE <permissions> ON <object> FROM <user>;

• Description: Revokes previously granted permissions on a database object from a user or a group.
• Permissions: Revoke specific permissions previously granted.
• Example:

  REVOKE DELETE ON customers FROM 'user2';
  

Useful Information:

• Access Control: DCL commands ensure security by managing access privileges and permissions within a database system.

• Object-Level Permissions: These commands operate at the object level, allowing control over who can perform specific actions (such as SELECT, INSERT, UPDATE, DELETE) on database objects like tables, views, procedures, etc.

• User Management: Grants and revokes permissions from specific users or groups, providing fine-grained control over the actions permitted within the database.

• Granular Control: Allows administrators to grant or restrict access based on the principle of least privilege, ensuring users only have the necessary permissions to perform their tasks.

These DCL commands play a critical role in ensuring data security and access control within a database system, controlling who can do what within the database objects.