主题：请教 SQL update 语句

 用代码处理

For Each dr As DataRow In DataTables("表A新").Select("")
    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"}
    Dim dr2 As DataRow = DataTables("表A").find("主键列 = '" & dr("主键列") & "'")
    If dr2 Is Nothing Then
        dr2 = DataTables("表A").AddNew()
        dr2("主键列") = dr("主键列")
    End If
    For i As Integer = 0 To Cols1.Length -1
        dr2(Cols2(i)) = dr(Cols1(i))
    Next
Next