google sheets data validation custom formula filter
-- Google Sheets: Using filter()
-- in custom formula in data validation
=query(filter('sheet1'!$A$2:$A, 'sheet1'$A$2:$A < 4),
"select Col1 where Col1 = '" & 'sheet2'!A2 & "'")
= 'sheet2'!A2
-- Note: The 'sheet2'!A2 must be
-- the first (top-left) cell of the validated rangeCopyright © 2021 Codeinu
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