Implement Full-Text Search in SQL (MySQL Example)

-- Ensure full-text index exists on columns:
-- ALTER TABLE articles ADD FULLTEXT(title, content);

SELECT
  id,
  title,
  content,
  MATCH(title, content) AGAINST ('+database +sql -nosql' IN BOOLEAN MODE) AS relevance_score
FROM
  articles
WHERE
  MATCH(title, content) AGAINST ('+database +sql -nosql' IN BOOLEAN MODE)
ORDER BY
  relevance_score DESC;
  -- Searches for 'database' AND 'sql' but NOT 'nosql' in title or content

How it works: This snippet demonstrates how to perform a full-text search using MySQL's `MATCH AGAINST` clause. It requires a `FULLTEXT` index on the columns you wish to search (`title`, `content`). The `IN BOOLEAN MODE` allows for powerful query operators like `+` (must include), `-` (must not include), and `*` (wildcard). The `relevance_score` indicates how well a row matches the search criteria, enabling sorting by relevance. This is ideal for implementing efficient keyword search features.