[wey97]

I tried searching the forum for the string "where not in" but the search didn't return any results. Then I tried the words separately where- not- in-
I expected the 'not' or 'in' to not return any results because too many threads would be returned. I think this is why they won't work.

Is there some way to search for this string?

[healdem]

you could try with wild cards inserted