如何在 SQL Server 中獲得准確的小數點？

Question

這是我的查詢，我只想得到最多 2 個小數點

select (select ISNULL(sum(CONVERT(decimal(6,2),w1.Party_Weight))/CONVERT(decimal(6,2),1000),0) from weight1 as w1)+
(select ISNULL(sum(CONVERT(decimal(6,2),w2.Party_Weight))/CONVERT(decimal(6,2),1000),0) from weight2 as w2)+
(select ISNULL(sum(CONVERT(decimal(6,2),w3.Party_Weight))/CONVERT(decimal(6,2),1000),0) from weight3 as w3) as Party_Weight

這個查詢結果是 4.493000 但我只想要 4.49。

Answer 1

做完算術轉換！

select convert(decimal(6, 2), sum(w1.Party_Weight) / 1000.0) 
from weight1 aw1