Dim dt As DataTable = DataTables("订单")
DataTables("销售统计").DataRows.Clear
For Each p As String() In dt.GetValues("产品ID|客户ID")
Dim dr As DataRow = DataTables("销售统计").AddNew()
dr("产品ID") = p(0)
dr("客户ID") =p(1)
dr("数量") = dt.Compute("sum(数量)" , "[产品ID]='" & p(0) &
"' And [客户ID]='" & p(1) & "'")
Next