求一语句

SQL code

select * from f3002where ixkitl='CR02CB(2+2)DWKL'select litm from old02 where litm='CR02CB(2+2)DWKL'

这两个函数查询都有结果。但是下面的语句就不可以。为什么？

SQL code

select * from f3002where ixkitl =(select litm from old02 where litm='CR02CB(2+2)DWKL');

求正确语句

[解决办法]

SQL code

select * from f3002where ixkitl in (select litm from old02 where litm='CR02CB(2+2)DWKL');
[解决办法]
探讨

SQL code

select * from f3002
where ixkitl in (select litm from old02 where litm='CR02CB(2+2)DWKL');

[解决办法]

子查询要用In，不要直接用那个等号，
select * from f3002
where ixkitl in (select litm from old02 where litm='CR02CB(2+2)DWKL');

仔细检查一下ixkitl与litm是不是对应的？