主题：统计求助？？？？

代码

Dim t As Table = Tables("销售明细")
Dim g As SubtotalGroup
t.SubtotalGroups.Clear()
t.GroupAboveData = False
t.TreeVisible = False
t.SpillNode = True

g = New SubtotalGroup
g.Aggregate = AggregateEnum.Sum
g.GroupOn = "日期"
g.TotalOn = "数量"
g.Caption = "{0}日 小计"
g.DateGroup = DateGroupEnum.Day
t.SubtotalGroups.Add(g)

g = New SubtotalGroup
g.Aggregate = AggregateEnum.Sum
g.GroupOn = "日期"
g.TotalOn = "数量"
g.Caption = "{0}月 小计"
g.DateGroup = DateGroupEnum.Month
t.SubtotalGroups.Add(g)

g = New SubtotalGroup
g.Aggregate = AggregateEnum.Sum
g.GroupOn = "日期"
g.TotalOn = "数量"
g.Caption = "{0}年 小计"
g.DateGroup = DateGroupEnum.Year
t.SubtotalGroups.Add(g)

t.Subtotal()