Question

#Region "FillListView"
    Sub FillListview()
        LV.Items.Clear()
        myqry = "SELECT AccResult.StudNo,Exercises.ID from AccResult INNER JOIN Exercises ON AccResult.StudNo = Exercises.ID ORDER BY AccResult.FirstName,AccResult.YrandSec Asc;"
        mycmd = New OleDbCommand(myqry, con)
        con.Open()
        mydr = mycmd.ExecuteReader
        While mydr.Read
              With LV
                .Items.Add(mydr("StudNo"))
                With .Items(.Items.Count - 1).SubItems
                    .Add(mydr("CNumber"))
                    .Add(mydr("FirstName"))
                    .Add(mydr("LastName"))
                    .Add(mydr("YrandSec"))
                    .Add(mydr("Exer1"))
                    .Add(mydr("Exer2"))
                    .Add(mydr("Exer3"))
                    .Add(mydr("Exer4"))
                    .Add(mydr("Exer5"))
                End With
            End With
        End While
        con.Close()
    End Sub
#End Region

AccResult是我的第一个表的名称，Exercises是第二个表。我AccResult的PK为StudNo，而Exercises为ID。如何将这两个表连接起来显示在ListView？

中

AccResult表：

StudNo (PK)
CNumber
FirstName
LastName
YrandSec

Exercises表：

ID (PK)
StudNo
Exer1
Exer2
Exer3
Exer4
Exer5

Answer 1

您的加入条件不正确。

AccResult INNER JOIN Exercises ON AccResult.StudNo = Exercises.ID

使用子表的主键（Exercises.ID）加入父表（AccResult.StudNo）的主键。您需要将父表（AccResult.StudNo）的主键与子表的外键（Exercises.StudNo）连接，即

AccResult INNER JOIN Exercises ON AccResult.StudNo = Exercises.StudNo

Answer 2

不确定我是否正确地得到了问题，但看起来查询只选择列：

myqry = "SELECT AccResult.StudNo,Exercises.ID from AccResult..."

然后代码尝试显示所有列。请尝试选择所有列：

myqry = "SELECT * from AccResult..."

Answer 3

试试这个：

myqry = "SELECT AccResult.StudNo,Exercises.ID, Exer1, Exer2, Exer3, Exer4, Exer5 from AccResult INNER JOIN Exercises ON AccResult.StudNo = Exercises.ID ORDER BY AccResult.FirstName,AccResult.YrandSec Asc;"

内部加入VB.Net

3 个答案: