For j As Integer = 1 To i Dim dr As DataRow dr("人均加工费_" & j &) =" iif(dr("投工_" & j &)=0,null,dr("加工费_" & j &) "/" dr("投工_" & j &)" If j-1 = 0 Then dr("环比_" & j &) = Nothing
Else dr("环比_" & j &) = iif(dr("人均加工费_" (j-1))=0,null,(dr("人均加工费_" & j &) / dr("人均加工费_" (j-1)))-1) End If Next