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SELECT CASE
  WHEN p.uid IS NOT NULL THEN p.title
  WHEN c.uid IS NOT NULL THEN c.header
END AS title

FROM qinx_collection AS qc

LEFT JOIN pages AS p
  ON qc.foreign_uid = p.uid
  AND qc.type = 'page'

LEFT JOIN tt_content AS c
  ON qc.foreign_uid = c.uid
  AND qc.type = 'content'

WHERE 1 = 1
  AND (p.uid IS NOT NULL OR c.uid IS NOT NULL)

SELECT
 tr.uid, tt_content.header, tr.header,
 IF(tr.uid IS NOT NULL, tr.header, tt_content.header) AS AAA

FROM tt_content
 LEFT JOIN tt_content AS tr
   ON tr.l18n_parent = tt_content.uid
   AND tr.header LIKE '%can%'

WHERE tt_content.header LIKE '%can%'
 AND tt_content.sys_language_uid IN (0,-1);