|M| 更新A表 数据由B表取要怎么来更新 谢谢
如表
A  
ID     总销售价   总成本价
1       100             50

B
ID   销售单ID     销售价   成本价
1     1                   30           20
2     1                   50           40
3     1                   50           40
------------------------------------
现在要由B表更新A表   最后为
A  
ID     总销售价   总成本价
1       130             100

SQL语句要怎么来写


------解决方案--------------------
update A set 总销售价=销售价 ,总成本价= 成本价
from A as t1
inner join
(select 销售单ID,sum(销售价) as 销售价,sum(成本价) as 成本价 from B group by 销售单ID) as t2 on t1.id=t2.销售单ID


------解决方案--------------------
UPDATE A set A.[总销售价] = B.[总销售价],A.[总成本价] = B.[总成本价]
from
(select ID,sum([总销售价])[总销售价],sum([总成本价])[总成本价] from B group by ID) B
where A.ID = B.ID