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, the right side must be a single value, not multiple values, and

in your first statement

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

will find multiple values, so Error Code: 1242. Subquery returns more than 1 row error

is reported The solution to

is to change where xxx = yyy into where xxx in(yyy) or where xxx = any yyy. These two expressions have the same meaning, but any can also be compared in other ways, such as where xxx > any yyy

Answer 2

any is quite in()