sql query

INSERT INTO competitions (user_id, headline, description, start_date, end_date, competition_artwork)
SELECT ${user_id}, ${headline}, ${description}, ${start_date}, ${end_date}, ${competition_artwork}
WHERE NOT EXISTS
    ( SELECT DISTINCT competitions
        FROM competitions
        WHERE id = (SELECT MAX(id) FROM competitions) and user_id = ${user_id} and headline = ${headline} and description = ${description} and start_date = ${start_date} and end_date = ${end_date} and competition_artwork = ${competition_artwork}
    ) RETURNING *;