SQL邏輯查詢語句執行順序
阿新 • • 發佈:2018-11-11
number HERE 語句 order distinct type limit con lis
SELECT語句語法順序
SELECT DISTINCT <select_list> FROM <left_table> <join_type> JOIN <right_table> ON <join_condition> WHERE <where_condition> GROUP BY <group_by_list> HAVING <having_condition> ORDER BY <order_by_condition> LIMIT <limit_number>
SELECT語句執行順序
(7) SELECT (8) DISTINCT <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_condition> (10) LIMIT <limit_number>
SQL邏輯查詢語句執行順序