SQL Role. CREATE ROLE creates a set of privileges which may be assigned to users of a database. Once a role is assigned to a user, (s)he gets all the Privileges of that role. By creating and granting roles, best means of database security can be practiced.
SQL roles are useful for administering privileges when a database has many users. Roles provide a more powerful way to grant privileges to users' sessions than to grant privileges to each user of the database, which easily becomes tedious and error-prone when many users are involved.
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