select * from supe_spacenews where itemid in
(SELECT relativeitemids FROM supe_spacenews WHERE itemid=4691)
这是我的sql语句，后面SELECT relativeitemids FROM supe_spacenews WHERE itemid=4691这句，查询出的结果是
4700,4681,4668,4651,4648 这样的结果。可是
select * from supe_spacenews where itemid in
(SELECT relativeitemids FROM supe_spacenews WHERE itemid=4691)这条sql语句取出的，只有4700这个id的信息，应该有5条才对啊。
