我們如何在MySQL中訂購聯合查詢？

Question

我有一個存儲過程像下面的MYSQL：

(SELECT 1 AS sort_col, col_a, col_b FROM t1 WHERE col_b LIKE %some% AND col_b LIKE %thing%) 
    UNION 
    (SELECT 2, col_a, col_b FROM t1 WHERE col_b LIKE %some% OR col_b LIKE %thing%) 
ORDER BY sort_col, col_a; 

我想的第一選擇顯示結果在第一，但的一些結果在第二個第一是常見的也是如此，和第二選擇改變了他們的sort_col到2 。（我不能在我的選擇中使用LIMIT） 我能做些什麼來解決它？

Answer 1

使用子查詢：

SELECT * FROM 
(
    (SELECT 1 AS sort_col, col1a, col1b FROM t1) 
    UNION 
    (SELECT 2, col2a, col2b FROM t2) 
) tbl 
ORDER BY sort_col, col1a; 

---

編輯（OP's edit後）

SELECT * FROM 
(
    (SELECT 1 AS sort_col, col_a, col_b 
    FROM t1 
    WHERE col_b LIKE %some% 
     AND col_b LIKE %thing%) 
    UNION 
    (SELECT 2, col_a, col_b 
    FROM t1 
    WHERE col_b LIKE %some% 
     OR col_b LIKE %thing%) 
) tbl 
ORDER BY sort_col, col_a;