Question

我很难找到如何做到这一点。我一直在寻找好几个小时，但却无法找到可行的解决方案。

我有两张桌子。

TableA - Code, TranDate, Amount

TableB - Code Amount

我希望通过扣除TableA中的金额总和来更新TableB金额（其中a.code = b.code 和a.TranDate＆gt; ＆＃39; A GIVEN DATE＆＃39;

我必须承认SQL的能力有限。我正在使用SQL Server 2005.

Answer 1

尝试：

@Date = 'A GIVEN DATE'
UPDATE TableB 
     SET TableB.Amount = TableB.Amount - (SELECT SUM(TableA.Amount) 
                                   FROM TableA as A, TableB 
                                   WHERE A.Code = B.Code AND A.TranDate > @Date)

Answer 2

试试这个：

UPDATE TB 
SET
    TB.Amount = TB.Amount - TotalDeduction
FROM TableB TB
JOIN (SELECT Code, SUM(Amount) AS TotalDeduction FROM TableA GROUP BY Code) TA ON TA.Code = TB.Code

Answer 3

declare @date date,
update TableB
set TableB.Amount= TableB.Amount-sum(TableA.Amount) from TableA, TableB
where TableA.code = TableB.code and TableA.TranDate >@date

Answer 4

使用公用表扩展的简便方法：

with cte as (
   select A.Code, sum( A.Amount ) as Amount
   from TableA A inner join TableB B on A.Code = B.Code 
   where A.TranDate > *someDete*
   Group by A.Code
)
update B
Set B.amount = CTE.amount
from TableB B inner join CTE on B.Code = CTE.Code

已编辑到期OP评论：

CTE可从sqlserver 2005获得：http://technet.microsoft.com/en-us/library/ms190766(v=sql.90).aspx

在sqlserver 2008上测试查询：http://sqlfiddle.com/#!3/9e424/1/0

使用另一个表中的字段总和更新字段

4 个答案: