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的时候，右边必须是单一的值，不能是多个值，而你第一个语句里面的

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

会查出多个值，所以报Error Code: 1242. Subquery returns more than 1 row的错误

解决的方法就是把where xxx = yyy变成where xxx in(yyy)或者where xxx = any yyy，这两个表达是一个意思，不过any还可以其他的比较，比如where xxx > any yyy

Answer 2

any 相当 in()