pencarian relevansi di beberapa tabel terkait

Berdasarkan jawaban di tautan yang Anda posting, Anda dapat melakukan sesuatu seperti ini

SELECT id,SUM(relevance) as total_relevance FROM (
SELECT 
    id, 
    (MATCH(title) AGAINST ('search string')) AS relevance
    FROM Cards
UNION
SELECT 
    Cards.id,
    (MATCH(brigade) AGAINST ('search string')) AS relevance
    FROM Brigades 
    INNER JOIN CardBrigades ON Brigades.id=brigade_id
    INNER JOIN Cards ON card_id=Cards.id 
UNION
SELECT 
    Cards.id,
    (MATCH(identifier) AGAINST ('search string')) AS relevance
    FROM Identifier 
    INNER JOIN CardIdentifier ON Identifier.id=identifier_id
    INNER JOIN Cards on card_id=Cards.id 
) AS combined_search 
GROUP BY id
HAVING total_relevance > 0

Saya tidak yakin seberapa baik kinerja ini. Anda mungkin lebih baik mencari solusi lain seperti Solr, Lucene, atau bahkan mesin penyimpanan NoSQL.