主题：我想对同列数据分条件不同计数统计

比如

Dim g As New GroupTableBuilder("统计表2", DataTables("aaa"))
g.Groups.AddDef("班级")
g.Totals.AddDef("科类", AggregateEnum.Count)
g.filter = "科类 like '外语%'"
g.Build()
MainTable = Tables("统计表2")

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