主题：[求助]内部数据库转成外部数据库后 出错了！！

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内部数据库转成外部数据库(.mdb)后，运行下面代码就出现错误了，求救！！！！！！
Dim cmd As New SQLCommand
Dim dt As DataTable
cmd.CommandText = " Select {销售订单}.客户编号, {送货明细}.送货数量, {销售订单明细}.单价, {送货明细}.送货数量* {销售订单明细}.单价 As 金额, {送货明细}.送货日期 FROM ({销售订单} INNER JOIN {销售订单明细} ON {销售订单}.[_Identify] = {销售订单明细}.销售订单ID) INNER JOIN {送货明细} ON {销售订单明细}.[_Identify] = {送货明细}.销售订单明细ID"
dt = cmd.ExecuteReader()

Dim g As New CrossTableBuilder("按周送货金额统计", dt)
    g.HGroups.AddDef("客户编号")
    g.VGroups.AddDef("送货日期", DateGroupEnum.Year, "{0}年")
    g.VGroups.AddDef("送货日期", DateGroupEnum.Week, "{0}周")
    g.Totals.AddDef("金额", "金额")
    g.VerticalTotal = True
    g.Decimals = 0
    g.Build()
Tables("按周送货金额统计").AutoSizeCols()
MainTable = Tables("按周送货金额统计")