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Compare two columns in same sheet and find difference

Hi I have an excel sheet with two columns- A and B. Each column has similar data and B has more data than A. How can I spot data which are available in B but not present in A?

A 12 13 14 15 and B 12 123 13 14 145 15 16

Use CountIf() or Vlookup(). Put in cell C2 this formula =countif(A:A,B2) and copy it down. You'll see 0 when they are unique.

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