主题：使用SQL语句统计库存数量，出错了，求助！

我做的项目想通过商品的两列hh、ph进行关联统计，最后统计出库存数量

但是不知道该怎样写了，求大师帮忙。

谢谢！

        Dim b As New SQLGroupTableBuilder("库存","kcmx")
        Dim Cols1() As String = {"hh","ph"}
        Dim Cols2() As String = {"hh","ph"}
        Dim Cols3() As String = {"hh","ph"}
        Dim Cols4() As String = {"hh","ph"}
        b.C
        b.AddTable("kcmx",Cols1,"xsdmx",Cols2)
        b.AddTable("kcmx",Cols1,"rkdmx",Cols3)
        b.AddTable("kcmx",Cols1,"qtck",Cols4)
        b.Groups.AddDef("hh")
        b.Groups.AddDef("ph")
        b.Totals.AddDef("xssl","销售")
        b.Totals.AddDef("rksl","入库")
        b.Totals.AddDef("cksl","出库")
        b.Totals.AddExp("库存数量","qtck + 入库 - 销售 - 出库")
        b.Build '生成统计表
        MainTable = Tables("库存")