ACCESS中，后一列根据前一列的数值自动填数？？？ ACCESS数据库里，一列数据已经有了，需要在另一列根据前一...
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UPDATE Tb SET B = switch(A>=40,2,A>0 and A<40,1,A is null,null);
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1、建立一个数据表，表中有2个字段A、B，全为字符型（见窗体视图）；
2、建立1个窗体，其上创建1个列表框，2个按钮（见窗体视图）；
3、按钮“清空B列数值”的单击事件中输入如下代码：
Private Sub Command2_Click()
strSQL = "UPDATE 表AB SET 表AB.B = ' ';" '清空
CurrentProject.Connection.Execute strSQL
Me.List0.Requery
End Sub
4、按钮“自动更新数值”的单击事件中输入如下代码：
Private Sub Command3_Click()
strSQL = "UPDATE 表AB SET 表AB.B = '2' WHERE (((表AB.A)>='40'));" '>=40
CurrentProject.Connection.Execute strSQL
strSQL = "UPDATE 表AB SET 表AB.B = '1' WHERE (((表AB.A)<'40' And (表AB.A)>'0'));" '<40 并且 >0
CurrentProject.Connection.Execute strSQL
strSQL = "UPDATE 表AB SET 表AB.B = '0' WHERE ((表AB.A)='0');" '=0
CurrentProject.Connection.Execute strSQL
strSQL = "UPDATE 表AB SET 表AB.B = ' ' WHERE (IsNull(表AB.A)=True or len(Trim(表AB.A))=0);" '=空
CurrentProject.Connection.Execute strSQL
Me.List0.Requery
End Sub
5、运行窗体，点击按钮就OK了。
假定前一列为A,后一列为B,在A的"更新后"事件中写入:
If Me![A] >= 40 Then
Me![B] = 2
Else
If Me![A] = 0 Then
Me![B] = 0
Else
If Me![A] < 40 Then
Me![B] = 1
Else
If IsNull(Me![A]) = True Then
Me![B] = Null
End If
End If
End If
End If
OleDbDataAdapter adapter = new OleDbDataAdapter(command,connection);
adapter.Fill(table);
int[] array = new int[table.rows.count];
for/foreach
没有语句可以使用，可以用其他方法，VB
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