Why does the order of the SELECT statements in the UNION affect the result?<BR><BR>This first SQL produces the result I want.<BR><BR>SELECT cat_id AS catid, manufacturer AS mfr, model, a_class_id as ...

Especially in the second edition, it has been fully updated for MySQL 8, and after reading it, you will feel that this is not just a book; it is more like a practical manual that helps you truly ...