oracle 相关子查询
select sum(t1.sales) from Store_information t1
where t1.store_name
IN （Select Store_name from Geography t2 where t2.store_name = t1.store_name）



以上sql文一运行就报错，有没有高手给解答一下是什么原因？

[解决办法]
你难道没看出来你的条件矛盾了吗？
不知道你的需求，猜测一下。

SQL code

select sum(t1.sales) from Store_information t1,Geography t2   where t1.store_name = t2.store_name;
[解决办法]
select sum(t1.sales) from Store_information t1 
 where t1.store_name 
 IN （Select Store_name from Geography t2 ，Store_information t1 where t2.store_name = t1.store_name）

[解决办法]
LZ贴下错误吧，表示没看出来错误在哪。
SQL code
select sum(t.operid) from operskill t where t.skillid in (     select skillid from skillinfo t1 where t.skillid =t1.skillid);
[解决办法]
SQL code
--用in，效率低select sum(t1.sales) from Store_information t1    where exists (Select 1 from Geography t2 where t2.store_name = t1.store_name);