Microsoft Sql Server Management Studio在選擇列表中無效

Question

我試圖從我的表中搜索並使用group by，但我在執行查詢時收到錯誤。下面是我的查詢，我得到的錯誤：

select * from loans where ac_no='100001' group by ac_no, branch 

和錯誤：

Msg 8120, Level 16, State 1, Line 1
Column 'loans.gl_no' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

請，我究竟做錯了

Answer 1

如果你想聚集的東西...

select ac_no, branch, count(*) 
from loans 
where ac_no = '100001' 
group by 
    ac_no 
, branch 

如果你只是想選擇行，你不需要group by

select * 
from loans 
where ac_no = '100001' 

如果您嘗試選擇不同的行...

select distinct * 
from loans 
where ac_no = '100001'