我们如何在MySQL中订购联合查询？

Question

我在MYSQL中有一个如下所示的存储过程：

    (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;

我首先想要第一个选择show的结果，但是第一个的一些结果在第二个中也很常见，第二个选择将sort_col更改为2.（我在选择中不能使用LIMIT） 我能做些什么来解决它？

Answer 1

使用子查询：

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

---

修改（OP's edit之后）

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;