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 ROLEStatements for Revoking Privileges 

The User PUBLIC

Firebird has a predefined user named PUBLIC, that represents all users.Privileges for operations on a particular object that are granted to the user PUBLIC can be exercised by any authenticated user.

Important

If privileges are granted to the user PUBLIC, they should be revoked from the user PUBLIC as well.

Assigning Roles

Assigning a role is similar to granting a privilege.One or more roles can be assigned to one or more users, including the user PUBLIC, using one GRANT statement.