Question

这是我正在尝试重现的查询：

select
    act.AccountID,
    ast.AssetID,
    b.Amount
from
    Account act left outer join
    Balance b on act.AccountID = b.AccountID left outer join
    Asset ast on b.AssetID = ast.AssetID

我正在尝试获得以下结果：

Dictionary(of Account, Dictionary(of Asset, Double))

Answer 1

从内存中，左连接是使用LINQ 2 SQL语法

中的简单from语句完成的

Dim dc as new myDataContext
Dim result = from act in dc.Accounts
         from b in dc.Balance
         from ast in dc.Asset
         select act.AccountID, ast.AssetID, b.Amount

Linq to SQL相当于这个查询

1 个答案: