I have a select statement as follows...
 
SELECT ... from user,class,category,assignment,grade
WHERE grade.assignment_id=assignment.assignment_id
AND assignment.category_id=category.category_id
AND category.class_id=class.class_id
AND class.teacher_id=user.user_id
AND user.user_id=87

Can I change this to a delete statement simply by changing SELECT to DELETE?  This select
displays the appropriate information I wish to delete from a table.