I'm hoping someone can help with a little problem I'm having with a query.

In the query below I wish to return as least one row per tbl1, however I am
only getting rows where there is at least an entry for tbl2 :

SELECT ...

FROM tbl1 as d
LEFT JOIN tbl2 as r ON d.dcode=r.dcode
LEFT JOIN tbl3 as pc ON (r.code=pc.code AND pc.from_period <= 200412 AND
pc.to_period > 200412)
LEFT JOIN tbl4 as st ON st.scode=r.scode

WHERE r.mcode='AB'
  AND d.status!='X'
  AND d.region='1A'
  AND r.year=2004
  AND r.month IN (1,2,3,4,5,6,7,8,9,10,11,12)
  AND st.group = 'B'

GROUP BY d.dcode, r.code


Can anyone help me see the light and show me where I'm being stupid?

TIA

Graham



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