Deletions are performed using the DELETE command:
DELETE FROM weather WHERE city = 'Hayward';
    
    All weather recording belongs to Hayward is removed.
    One should be wary of queries of the form
    DELETE FROM classname;
    
    Without a qualification, DELETE will simply
    remove  all  instances  of  the given class, leaving it
    empty.  The system will not request confirmation before
    doing this.