理解sql語句的關鍵

    我發現自己理解起sql語句來很困難，今天看了一本書，頓時茅塞頓開，貼出來和大家分享一下

  

    

 select語句執行順序

 (7)SELECT (8)DISTINCT (10)<TOP_specification> <select_list>
(1)FROM <left_table>
(3)　<join_type> JOIN <right_table>
(2)　　　 ON <join_condition>
(4)WHERE <where_condition>
(5)GROUP BY <group_by_list>
(6)HAVING <having_condition>
(9)ORDER BY <order_by_list>