using union in limit with pagination

Question

please can someone help with mysql query with pagination for "union" select statement.using page limit and offset limit

below is my sql if am getting it wrong.

 $sqlQuery = "SELECT title, content, img, postlink, created_at, 'forum' as type FROM forum_post WHERE title LIKE CONCAT('%', :keyword, '%')
    UNION  SELECT title, content, img, postlink, created_at, 'music' as type FROM music_post WHERE title LIKE CONCAT('%', :keyword, '%') UNION 
    SELECT title, content, img, postlink,created_at, 'video' as type FROM video_post WHERE title LIKE CONCAT('%', :keyword, '%') ORDER BY created_at DESC LIMIT   ".($lower_limit)." ,  ". ($page_limit). "";

here is the full sql code in pdo

here is the full sql query `public function all_search($keyword, $lower_limit, $page_limit) {
    $sqlQuery = "SELECT * FROM(SELECT title, content, img, postlink, created_at, 'forum' as type FROM forum_post WHERE title LIKE CONCAT('%', :keyword, '%')
    UNION  SELECT title, content, img, postlink, created_at, 'music' as type FROM music_post WHERE title LIKE CONCAT('%', :keyword, '%') UNION 
    SELECT title, content, img, postlink,created_at, 'video' as type FROM video_post WHERE title LIKE CONCAT('%', :keyword, '%')) tab LIMIT   ".($lower_limit)." ,  ". ($page_limit). "";
    $stmt = $this->conn->prepare($sqlQuery);
    $stmt->execute(['keyword'=>$keyword]);
    $result = $stmt->fetchAll(PDO::FETCH_ASSOC);

    return $result;
}`

Answer 1

Try this

$sqlQuery = "SELECT * FROM(SELECT title, content, img, postlink, created_at, 'forum' as type FROM forum_post WHERE title LIKE CONCAT('%', :keyword, '%')
        UNION  SELECT title, content, img, postlink, created_at, 'music' as type FROM music_post WHERE title LIKE CONCAT('%', :keyword, '%') UNION 
        SELECT title, content, img, postlink,created_at, 'video' as type FROM video_post WHERE title LIKE CONCAT('%', :keyword, '%'))tab LIMIT   ".($lower_limit)." ,  ". ($page_limit). "";