Question

这是我的sql代码

SELECT   M.PartNo AS ModulePartNo,
(SELECT SUM(Delivered - Allocated) 
FROM V_InStock Stk
WHERE Stk.PartNo = M.PartNo) AS Available
FROM V_Products M
WHERE M.PartNo='100-25897'

我在Linq工作时遇到了真正的问题，无法解决这个问题 - 任何帮助都会非常感激

Answer 1

这应该有用。

var query = from stk in V_InStock
            group stk by stk.PartNo into stkg
            where stkg.Key == '100-25897'
            select new
            {
              ModulePartNo = stkg.Key,
              Available = stkg.Sum(s => s.Delivered) - stkg.Sum(s => s.Allocated)
            }

Answer 2

如果你需要进行聚合分组等，你可能需要设置一个对象来“选择”所有内容。但是对于直接连接，这样的事情应该有效。

  var outputObject = (from t1 in dbContext.table1
  join t2 in dbContext.table2 on t1.PartNo equals t2.PartNo
  select (t1.Delivered - t2.Allocated));

Linq问题选择一列的总和减去另一个表中的另一列

2 个答案: