mysql - sql subquery return more than 1 row

Question

update orders_father set ostatus=5,ofintimesys=now() where oid =
(select oid from
(SELECT oid FROM orders_father where TIMESTAMPDIFF(HOUR,odlvtime,now())>parameter and ostatus=4)
as tempTable)
;

这是代码1。

    update orders_father set ostatus=5,ofintimesys=now() where oid =any
(select oid from
(SELECT oid FROM orders_father where TIMESTAMPDIFF(HOUR,odlvtime,now())>parameter and ostatus=4)
as tempTable)
;

这是代码2，在oid=后面增加了any

我的疑问是，为何代码1会出现Error Code: 1242. Subquery returns more than 1 row
这种错误，而代码2不会？ 谢谢各位大神

背景：我是在存储过程中使用的...

Answer 1

where xxx = yyy的時候，右邊必須是單一的值，不能是多個值，而你第一個語句裡面的

(SELECT oid FROM orders_father where TIMESTAMPDIFF(HOUR,odlvtime,now())>parameter and ostatus=4)
as tempTable)

會查出多個值，所以報Error Code: 1242. Subquery returns more than 1 row的錯誤

解決的方法就是把where xxx = yyy變成where xxx in(yyy)或where xxx = any yyy，這兩個表達是一個意思，不過any還可以其他的比較，比如where xxx > any yyy

Answer 2

any 相當 in()