#96 — Identify Duplications of Row-Based Data — by Key Column

Problem description & analysis:

Here below is a personnel data table:

Task: Identify whether there are duplicate data, if so, fill in 1 in the corresponding Dup field, otherwise fill in 0 (the identifying basis is that the data in the Name field are the same).

Solution:

Use SPL XLL and enter the formula in cell E2:

=spl("=if(?1.conj().select(~==?2).count()>1,1,0)",B$2:B$7,B2)

Then drag E2 down to every relevant row:

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