主题：联合主键在Foxtable中如何实现

 增加之前，先查询

Dim Cols1() As String = {"来源列一","来源列二","来源列三"}
Dim Cols2() As String = {"接收列一","接收列二","接收列三"}
For Each dr1 As DataRow In DataTables("表A").Select("")
    Dim dr2 As DataRow = DataTables("表B").Find("某列 = '" & dr1("某列") & "' and 某列 = '" & dr1("某列") & "'")
    If dr2 Is Nothing Then
        dr2 = DataTables("表B").AddNew()
        dr2("某列") = dr1("某列")
    End If
    For i As Integer = 0 To Cols1.Length -1
        dr2(Cols2(i)) = dr1(Cols1(i))
    Next
Next

你可以在sql里面设置联合主键，输入错误的话也会有提示的。