On 16/09/2010 16:05, Christine Penner wrote:
I have a query that joins 3 tables, TRAIN_MOD,TRAIN_COMP and
TRAINING_COURSE,
There could be many training_course records for each of the other
tables. I want to get all records from the Train_mod and Train_comp
table even if there are no training course records available. This is
the query I'm trying and I get nothing. The data I'm trying this on has
no training_course records but does have records in the other tables.
What am I doing wrong.
SELECT *
FROM TRAIN_MOD LEFT OUTER JOIN TRAINING_COURSE ON
TRAIN_MOD.TRM_SEQ_NO=TRAINING_COURSE.TC_TRM_SEQ
LEFT OUTER JOIN TRAIN_COMP ON TRAIN_MOD.TRM_TRC_SEQ=TRAIN_COMP.TRC_SEQ_NO
where TC_PUB_ED IS TRUE OR TC_SEQ_NO IS NULL
Can you show us the table schemas?
Also, I think it's a good idea to qualify the columns in the WHERE
clause, to prevent any possible ambiguity. Without seeing the table
definitions I'm only guessing, but is it possible that these are doing
something other than what you expect?
Ray.
PS - I personally find all-caps SQL very hard to read. :-)
--
Raymond O'Donnell :: Galway :: Ireland
r...@iol.ie
--
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general
