mysql - 如何将 select * 与 union 一起使用？ mysql

Question

我想运行此查询:

SELECT col1 , col2 , table1.*
    FROM
    (SELECT table2.col1 as col1 , table2.col2 as col2 , table1.* FROM table1 INNER JOIN table2 ...
    UNION
    SELECT table3.col1 as col1 , table2.col2 as col2 , table1.* FROM table1 INNER JOIN table2 ...
    )order by table1.col1

但我无法运行它，因为我应该将 ( SELECT col1 , col2 , table1.*) 处的 table1.* 替换为 table1 列名称。

Answer 1

您需要为联合查询指定别名。

类似于:

SELECT col1 , col2 , talias.*
FROM
(SELECT table2.col1 as col1 , table2.col2 as col2 , table1.* FROM table1 INNER JOIN table2 ...
UNION
SELECT table3.col1 as col1 , table2.col2 as col2 , table1.* FROM table1 INNER JOIN table2 ...
) as talias order by talias.col1