Comparison/conditional formatting of two columns

Christ143uk

New Member
Joined
Apr 4, 2019
Messages
1
Hi,

So my problem is:

I have a list of 1 million rows of phone numbers
I have a list of 500,000 phone numbers
In both of these lists phone numbers are repeated so I cannot use conditional formatting to highlight duplicates.

Basically I need to highlight any phone numbers/rows in the 1 million lines that also appears in the list of 500,000 phone numbers at least once.

Thanks in advance
 

Excel Facts

Remove leading & trailing spaces
Save as CSV to remove all leading and trailing spaces. It is faster than using TRIM().
Assuming both lists are in column A.
Select A2 to last row in A & use this CF formula
=ISNUMBER(MATCH(A2,Sheet1!A:A,0))
change the sheet name to suit
 
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