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---- [求助]空值排名问题 (http://www.foxtable.com/bbs/dispbbs.asp?boardid=2&id=118852)
-- 发布时间：2018/5/12 10:30:00
-- [求助]空值排名问题
各位老师，有个疑问，比如成绩表中物理没有考试，即没有分数，下列代码生成排名时，还是有排名（全部都是1）
如果物理、化学没有考试，能不能不生成排名（即排名列为空）呢？
此主题相关图片如下：1234.jpg
源代码如下：
Tables("成绩表").StopRedraw
Dim bjs As List(Of String) = DataTables("成绩表").GetValues("年级","[年级] Is Not NULL")
Dim Count As Integer
Dim ColNames() As String = {"语文","数学","英语","化学","物理","总分"}
Dim TotalName As String
For Each ColName As String In ColNames \'
For i As Integer = 0 To bjs.Count -1
Dim drs As List(Of DataRow) = DataTables("成绩表").Select("[年级] = " & bjs(i), ColName & " DESC")
Count = 0
TotalName = ColName & "排名"
For n As Integer = 0 To drs.Count - 1
Count = Count + 1
If n > 0 AndAlso drs(n)(ColName ) = drs(n-1)(ColName) Then
drs(n)(TotalName ) = drs(n-1)(TotalName )
Else
drs(n)(TotalName ) = Count
End If
Next
Next
Next
Tables("成绩表").Sort = "总分 DESC"
Tables("成绩表").ResumeRedraw
-- 发布时间：2018/5/12 11:01:00
--
只取有值的进行排名
Dim drs As List(Of DataRow) = DataTables("成绩表").Select("[年级] = " & bjs(i) & " and " & ColName & " is not null", ColName & " DESC")