Frage zu SQL Komma-Join

[Grolle]

SQL-Code:

SELECT n.recipient,n.start_date, c.contact_id, c.send_date
FROM correspondence c
LEFT JOIN (SELECT FIRST 0 * FROM notes) n
  ON 1 = 1
WHERE c.contact_id = 22
UNION
SELECT n.recipient,n.start_date as sortdate, c.contact_id, c.send_date  as sortdate
FROM notes n
LEFT JOIN (SELECT First 0 * FROM correspondence) c
  ON 1 = 1
WHERE n.recipient = 22 order by sortdate

Das mag er aber nicht. Wo ist denn da der Fehler