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Differences in two columns

Posted on 2016-08-25
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Last Modified: 2016-08-28
Hi All,

I need your assistance with excel.

I have two columns in Excel, Column A and Column B, both columns contain employee emails. The difference is that column A contains last year’s employee emails and column B contains the current list of employee emails.

Could you please help with me identifying the emails from column A not in column B. There are approx. 3000 rows .

Thank you in advance.
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Question by:jose11au
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9 Comments
 
LVL 12

Expert Comment

by:Missus Miss_Sellaneus
ID: 41771148
1. Sort the emails in column B, alphabetically.
2. Make sure column B is formatted as general, not text. Maybe A too.. can't recall which is important.

Lets assume for the example that the first row in column B w/ emails is row 2 and the last is row 200 in the following formula.
3. In C2, put =VLOOKUP(A2,B$2:B:$200,2,FALSE)
copy down through C200 (last row with values in A).

Now, for every cell in C greater than zero, the email in A has a match in B.
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LVL 12

Assisted Solution

by:Missus Miss_Sellaneus
Missus Miss_Sellaneus earned 83 total points
ID: 41771149
If you want to sort the sheet based on the VLOOKUP results, first copy column C and paste/values. It won't work if you sort on anything other than B.
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LVL 27

Assisted Solution

by:Glenn Ray
Glenn Ray earned 83 total points
ID: 41771177
The VLOOKUP function that Missus Miss_Sellaneus is showing will either return an identical email if a value in A has a match in B -OR- it will return #N/A if there is no match.  

An alternative would be to use the COUNTIF function like so.  Beginning with data in row 2, add this formula in column C and copy down as far as the emails in column A:
C2:  =COUNTIF(B:B,A2)

if the email in cell A2 has a matching value (or values) in B, the number of matches will result; zero if no matches.

There should be no effect if you decide to resort your data by any of the columns.

Regards,
-Glenn
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LVL 31

Accepted Solution

by:
Subodh Tiwari (Neeraj) earned 251 total points
ID: 41771196
If your intention is just to identify which email from col. A is not present in col. B, why not use conditional formatting on Col. A to identify those emails? So that you don't need to place any formula on the sheet.

In the attached, I have applied a conditional formatting on col. A to highlight any cell if it's content is not present in col. B. I have placed some numbers in both the columns to demonstrate how would it work.
You may replace them with actual emails.

The following formula is used for conditional formatting.
=AND(A1<>"",COUNTIF(B:B,A1)=0,ROW()>1)

Open in new window

To apply this conditional formatting to your own workbook follow these steps....
  • Select the whole column A.
  • Click on conditional formatting and choose New Rule.
  • Select "Use a formula to determine which cells to format".
  • In the formula box, type the formula given above. (or just copy the above formula and paste it in there)
  • Click on Format and set the format as per your requirement. You can set the fill color, font, border etc.
  • Click OK to finish.
For details, refer to the attached.
EETEST.xlsb
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LVL 33

Assisted Solution

by:Rob Henson
Rob Henson earned 83 total points
ID: 41771358
If your intention is to create one list containing all relevant emails but with no duplicates. Copy and paste the lists into one column and then sort that column. Then use the duplicate wizard to remove duplicates.

Thanks
Rob
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LVL 27

Expert Comment

by:Glenn Ray
ID: 41771915
^^^This is what I love about Excel:  there is often more than one method available to provide a solution.  We have four good examples here (VLOOKUP, COUNTIF, Conditional Formatting, Remove Duplicates); we just need to see the context of the question and how the results need to be used.
1
 
LVL 31

Expert Comment

by:Subodh Tiwari (Neeraj)
ID: 41772027
Well said Glenn! :)
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Author Comment

by:jose11au
ID: 41773486
Thank you so much. All solutions are acceptable and work just fine. will split the points.
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LVL 31

Expert Comment

by:Subodh Tiwari (Neeraj)
ID: 41773495
You're welcome. Glad we could help.
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