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This query gives the desired results on SQL Server but not in SQLite.
Desired result: return all letters that are not used in vocabulary words.
SELECT letter
FROM alphabet
WHERE NOT EXISTS (
SELECT word
FROM vocabulary
WHERE word LIKE '%'+ letter + '%')
On SQL Server all the unused letters are returned, but on SQLite every letter (row in alphabet) is returned.
Do you know how I can get the desired result in SQLite?
SQLite uses
||to concatenate. What you’re doing is addition.