Dim b As New CrossTableBuilder("统计表2", DataTables("个人成绩_主表"))
b.HGroups.AddDef("被考核人")
b.VGroups.AddDef("签订日期", DateGroupEnum.Year, "{0}年")
b.VGroups.AddDef("签订日期", "{0}月")
b.Totals.AddDef("本月成绩", "成绩分数")
'b.Totals.AddDef("本年成绩", AggregateEnum.Average, "平均分")
b.VerticalTotal = True
b.HorizontalTotal = True
上面代码,增加如何统计每年平均分?