如何从两张表格中获取我的信息？

Question

Dim LocationList = 
From rows In db.Locations, clientRow In db.Clients, stateData In db.Ref_States 
Where rows.State = stateData.ID 
Select ClientName = clientRow.Name, rows.ID, rows.Address1, rows.Address2, rows.City, StateName = stateData.Name, ShortStateName = stateData.ShortName, rows.ZipCode Order By Address1 

这就是我的，这是非常错误的。一切都显示出来了，但数据显示不正确，显示的行比现有的多。

我想我可能有它，但你可以看看我的代码，并告诉我，如果你看到任何问题？

 Dim LocationList = 
     From rows In db.Locations, clientRow In db.Clients, stateData In db.Ref_States 
     Where rows.State = stateData.ID And rows.ClientID = ucClientID And rows.ClientID = clientRow.ID 
     Select ClientName = clientRow.Name, rows.ID, rows.Address1, rows.Address2, rows.City, StateName = stateData.Name, ShortStateName = stateData.ShortName, rows.ZipCode Order By Address1 

Answer 1

这里假设你的外键映射到Location.State Ref_State.ID

Dim LocationList = From rows In db.Locations _ 
        Join rs In Ref_State On rows.State Equals rs.ID _ 
        Order By rows.Address1 _ 
        Select rs.Name 

上述回答你原来的问题。

Dim LocationList = _ 
    From clientRow In db.Clients _ 
    Join rows in db.Locations On clientRow.ID Equals rows.ClientID _ 
    Join db.stateData In Ref_States On rows.State Equals stateData.ID _ 
    Select ClientName = clientRow.Name, rows.ID, rows.Address1, rows.Address2, rows.City, StateName = stateData.Name, ShortStateName = stateData.ShortName, rows.ZipCode _ 
    Order By Address1 

与加入明确使它更具可读性，我认为写作是：将客户表之后，如下我会写查询。