如何在不折叠数据的情况下实施分组

Question

我简化了我的查询，所以现在看起来如下：

SELECT allaccounts.*, groups.TOTALGROUPAMOUNT
FROM 
(**SELECT FROM DUMMYTABLE WHERE...**) allaccounts,
(SELECT groupID, SUM(memberAmount) totalGroupAmount FROM(**SELECT FROM DUMMYTABLE WHERE...**) group by groupID) groups
WHERE allaccounts.groupID = groups.groupID 

SELECT FROM DUMMYTABLE WHERE ...的位置如下：

GROUP|ACCOUNT|BALANCE
A    |101    |1000
A    |102    |2000
A    |103    |3000
B    |104    |4000
B    |105    |5000
C    |106    |6000

根据上面的查询，我希望得到以下结果：

GROUP|ACCOUNT|BALANCE|TOTALGROUPAMOUNT
A    |101    |1000   |6000
A    |102    |2000   |6000
A    |103    |3000   |6000
B    |104    |4000   |9000
B    |105    |5000   |9000
C    |106    |6000   |6000

所以我的问题是可以让分组不使用＆＃34; SELECT FROM DUMMYTABLE WHERE ... ＆＃34;两次？

感谢您的回答和提前建议！

Answer 1

使用sum() over()。

select t.*, sum(balance) over(partition by grp) totalgroupamount
from tablename t