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# Excel/Matching data in 2 columns, then calculating based on 2 supporting columns

Question
Hello

I have 4 columns of data that I need to compare

EG.
Material A   Count A   Material B  Count B
xyz          2         abc         3
abc          1         aaa         1
fff          1         xyz         4

i need to compare material A with material B - if there is a match i need to subtract count B from Count A

i thought i was vaguely ok at excel but reality has bitten.  am investigating match, sum nesting formula etc, but long and short i'm stuck

can you help?

much appreciated

Michelle,

assume xyz in Material A is cell A2  then

=Match(A2,C:C,0)  would return 4  (cell C4)

to get the 4 under count B you would do

=Index(D:D,Match(A2,C:C,0),1)

then

say you are doing this in E2

E2:  =\$B2-INDEX(\$D:\$D,MATCH(\$A2,\$C:\$C,0),1)
you can then select E2 and drag fill (or copy and paste) it down column E.

Now if you don't get a match, the result would be #N/A.  you can avoid that with

E2: =if(iserror(\$B2-INDEX(\$D:\$D,MATCH(\$A2,\$C:\$C,0),1)),\$B2,\$B2-INDEX(\$D:\$D,MATCH(\$A2,\$C:\$C,0),1))

does that answer the question?  This assumes only one or zero matches in column C.

--
Regards,
Tom Ogilvy
Questioner's Rating
 Rating(1-10) Knowledgeability = 10 Clarity of Response = 10 Politeness = 10 Comment Wow, Thank you Tom. Crystal clear and exactly the response I needed. You are the best Thanks again, much appreciated, MIchelle

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#### Tom Ogilvy

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Selected as an Excel MVP by Microsoft since 1999. Answering Excel questions in Allexperts since its inception in 2001. Able to answer questions on almost all aspects of Excel's internal capabilities. If seeking a VBA solution, please specify that in your question itself so I give you the answer you want. [Excel has weak protection - if you are distributing an application, I don't answer questions on how to protect your project from your users.]

##### Experience

Extensive experience.

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Master of Science (MS) degree Operations Research (ORSA)

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Microsoft MVP in Excel.