Stacking multiple columns on to one?

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Updated Answer

I was right there is a much better solution. It’s been posted below but I’m copying it here so it’s in the top answer:

=unique({A:A;B:B})

Caveat: This will include one blank cell in certain scenarios (such as if there’s one at the end of the first list).

If you’re not concerned with ordering and a tailing blank cell a simple sort() will clean things up:

=sort(unique({A:A;B:B}))

Otherwise a filter() can remove the blanks like so:

=filter(unique({A:A;B:B}),NOT(ISBLANK(unique({A:A;B:B}))))

The following is the old deprecated answer

I’m confident that this is “The Wrong Way To Do It”, as this seems such an absurdly simple and common task that I feel I must be missing something as it should not require such an overwrought solution.

But this works:

=UNIQUE(TRANSPOSE(SPLIT(JOIN(";",A:A,B:B),";")))

If your data contains any ‘;’ characters you’ll naturally need to change the delimiter.

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