Formula to return 0 if number of unique values in a row is greater than 1

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Thank you and apologies.

Here, try this:

Formula:

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Where in your case range is Table1[@[Stage 1]:[Stage 14]]

This would be even better in case you don't assign numbers in the order (ie Stage1 0, Stage2 0, Stage3 23)

Formula:

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Replace ; with , if you get error.

Or ...

=IF(COUNTIF(Table1[@[Stage 1]:[Stage 14]],[@[Stage 1]])=COUNTIF(Table1[@[Stage 1]:[Stage 14]],">0"),[@[Stage 1]],0)

Zbor: this is great, thank you. However, we are quite there yet. Let's take row 7 for example. If the employee number is logged only under column C, the result changes to 0, even if only one employee is logged between A7:N7. Can the formula be extended to capture columns B:N? Thanks again!

See post #5.

Also for Phuocam formula that would be like:

Formula:

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Zbor: Brilliant! Thanks so much. Problem solved.
Phuocam: Thanks so much!