Simple roll-up not working

I want to count the number of attendees on course. I’ve uplodad a pic of the formula. Any ideas what I’ve done wrong?

You’ll want to use the aggregate function…


SUM() is meant for numeric values :slight_smile: COUNTA() will count all non-empty values.

Hope this helps!

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Drrr! Of course. Many thanks. I knew it was an easy one.

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