Lookup function for matching ID's and then populating an additional value - Vlookup

问题

I have a data set:

ID Name Amount BID        BID 2
1  Jack 100     1          
1  John 200     *Blank*    
2  Tony 300     2          

How can I lookup the ID and where the ID is matching look at the BID and find the relating ID value where the ID value has been populated for the same ID. I want the value to appear in BID 2 which is in column 5.

IE John should have a BID of 1 as his ID is 1 like Jacks ID.

I have tried

 =vlookup(A2,A2:C5,3,FALSE)

回答1:

I honestly don't know a way to do this through formula, but a VBA solution would look like this:

Sub FindTheValue()

Dim sht As Worksheet, lastrow As Long, i As Long, j As Long

Set sht = ThisWorkbook.Worksheets("Sheet1")
lastrow = sht.Cells(sht.Rows.Count, "C").End(xlUp).Row

For i = 1 To lastrow
    If Range("Z" & i).Value = "" Then
        For j = 1 To lastrow
            If Range("C" & i).Value = Range("C" & j).Value And Range("Z" & j).Value <> "" Then
                Range("AA" & i).Value = Range("Z" & j).Value
                Exit For
            End If
        Next j
    End If
Next i

End Sub

来源：https://stackoverflow.com/questions/49015763/lookup-function-for-matching-ids-and-then-populating-an-additional-value-vloo