Lets say I have 3 columns of data
AMOUNT(A) AMOUNT(B) INVOICE(C)
55 49 4541
47 47 1515
42 47 4478
86 12 9993
12 100 1224
5 44 1452
100 4287
99 4444
What I need to check to see if the value in column A matches a value in column B. If there is a match, it will return the value from column C in column D. Now this is easy with a VLOOKUP however I am dealing with 700+ lines and there are multiple amounts that match. INDEX(MATCH) could work but it only returns one value. Is this a VB only problem?
I.E Value 47 exists in column B twice so therefore column D would return both invoice numbers (1515 – 4478)
In VBA, the problem would be trivial as you have already correctly described the logic with the problem statement itself.
Using Excel functionality only, without VBA is the interesting problem. You need to do the following steps to achieve an output that looks like this…
The steps are as follows:
 Pivot Table: Make a pivottable from the Columns
(B)
and(C)
with Rows Fields as(B)
and(C)
and the minimum ofAMOUNT(B)
as the Value field. (See Figure below)  Helper Columns: Make a column on the side of the pivot table, say
(Q)
which is simply equal to everything in column(P)

Contd … : In column
(R)
(which unfortunately happens to be in the sheet’s column Q, sorry for the confusion there), as shown, for cellQ20
for e.g. put in the formula=IF(P21=P20,Q21&","&M20,M20)

That will result in the creation of something like the table below:
Table:
(P) (Q)
12 9993
44 1452
47 4478,1515
47 4478
49 4541
99 4444
100 4287,1224
100 4287
Now the hard work is done. All you need to do is to lookup using VLOOKUP
keyvalue pairs from this helper table (P)(Q)
– It will be very fast because the pivot table always keeps it sorted and hence an exact LOOKUP
is not necessary.
– Screenshots are shown below for the Pivot table as well as for the final VLOOKUP
formula
Pivot Table and Helper Table:
Final Formula:
Answer：
so I’m using the Countif to see if there are dups based on column A.
In the D column type, =IF(COUNTIF($A$2:$A$9,B2)>0,C2,"")
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