Subject V6s5 & FireBird - Join condition for a self joined table
Author Venus Software Operations
Hi All

Recently I have this join:



SELECT MSALESREPS.*,
MSALESREPS_A.CNAME AS CSPONNAME,
MSALESREPS_A.CCITY AS CSPONCITY,
MSALESREPS_A.CCODE AS CSPONCODE
FROM MSALESREPS MSALESREPS
RIGHT OUTER JOIN MSALESREPS MSALESREPS_A
ON MSALESREPS.IPID = MSALESREPS_A.IID
ORDER BY MSALESREPS.CNAME, MSALESREPS.CCITY



This is a self joined table, but not necessarily all the records are self
joined. the above works only to an extent, in the case of a record which is
not self joined (iPID is not populated) still a join is performed with the
first record giving the 3 cSpon* fields with wrong values when they are
supposed to be blank/null. This not-self-joined record is to be available
in the cursor/query as also the self-joined records with their respective
values in the cSpon* fields.

In VFP a LEFT JOIN would solve such a problem and I have tried it
successfully. In FB LEFT JOIN of the original VFP code does not work at all
and returns a null record.

Please advise.

Regards
Bhavbhuti


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