错了
是
(
SELECT '' AS Code,type as Type
FROM test1
WHERE 1
)
UNION ALL (SELECT code AS Code,'' as Type
FROM test2
WHERE 1
)
是
(
SELECT '' AS Code,type as Type
FROM test1
WHERE 1
)
UNION ALL (SELECT code AS Code,'' as Type
FROM test2
WHERE 1
)
前两天我也碰到了
不知道真假阿。自己再研究吧。