SELECT journalists_replay.id AS replay_id, journalists_replay.date AS replay_date, journalists_replay.user_id AS user_id, journalists_replay.user_type AS user_type, journalists_replay.text AS replay_text, IF(journalists_replay.user_type=’journalists’, SELECT(CONCAT_WS(‘ ‘, TRIM(journalists.name), TRIM(journalists.surname)) as user_name, journalists.photo as user_photo, journalists.posts as user_posts WHERE journalists_replay.user_id = jounalists.id, SELECT(CONCAT_WS(‘ ‘, TRIM(prs.name), TRIM(prs.surname)) as user_name, prs.photo as user_photo, prs.posts as user_posts) FROM journalists_replay WHERE journalists_replay.post_id = ’69′ AND journalists_replay.enabled ORDER BY journalists_replay.date DESC;

I can’t find a solution for this.
Best regards.

SELECT
q_id,
q_timestamp,
IF(q_is_answered,
SELECT q_title FROM answered_questions WHERE q_id=q.q_id,
SELECT q_title FROM unanswered_questions WHERE q_id=q.q_id) as q_title
FROM
questions q

I believe this is clearer, shorter and will run faster.
(It also assumes that each of the subqueries will return a single value.
The original solution does not handle this situation well either.)