求教，错在哪，很菜，不好意思。
我试过可以增加一个列，赋值后在表达示列里计算，不过想试着不增加数据列计算
Dim y As Integer = Date.Today.Year
Dim m As Integer = Date.Today.Month
Dim d As Integer = Date.Today.Day
Dim dt1 As New Date(y, m, 1)
Dim dt2 As New Date(y, m, d)
Dim d3 As New Date(y, m, d)
Dim dt3 As Date = d3.AddDays( - 1) '减去1天
Dim memory1 As Double = DataTables("日").Compute("库存量", "[日期] = #" & dt2 & "#")
Dim memory2 As Double = DataTables("日").Compute("库存量", "[日期] = #" & dt3 & "#")
Dim memory As Double = memory1 - memory2
DataTables("日").ReplaceFor("库存量差值", memory, "[日期] = #" & dt2 & "#")
加好友 
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Post By：2022/7/15 23:22:00 [显示全部帖子]
