The first formula given at that web page worked for me once I'd tinkered with the details to fit my actual case. And I needed to replace commas by semicolons. (The formula as given will not find instances of zero in the list.)Note that it is an array formula, so you need to complete it using Ctrl+Shift+Enter instead of plain Enter. The formula will then show with {braces} around it in the Input Line (but you cannot achieve the same result by typing braces yourself).Note also that it seems that you cannot fill the array formula down the column by dragging the fill handle. Instead, copy the formula from the original cell, select all the target cells, and paste.I trust this helps.
Indeed in B2 (first enter) it seems to work fine. I should have clarified, when I copy/paste in selected range (B column starting at B3) the value in B2 just gets repeated (ie. it's not finding unique values, instead it's just repeating the first found value in A column.
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