总结两行[关闭]

Question

输入：

A       
-----
 5000      
 4000      
-3000
-2000

输出：

A      FEEDBACK
-----  --------
 9000  POSITIVE
-5000  NEGATIVE

他们已经给出了输入。我需要编写代码来输出。

Answer 1

我认为这个查询应该这样做：

select sum(a) as a, 'POSITIVE' as feedback from t where a >= 0 
union
select sum(a) as a, 'NEGATIVE' as feedback from t where a < 0