> -----Original Message----- > From: Marko Asplund [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 15, 2003 4:31 PM > To: [EMAIL PROTECTED] > Subject: [SQL] Oracle outer join porting question > > > > i'm trying to port an existing application from Oracle8i to > PostgreSQL but > i'm having problems understanding a certain outer join query > type used in > the application. the query includes a normal outer join > between two tables > but also uses outer join syntax to join a table with a > constant. here's a > simplified version of the query: > > SELECT doc.id,doc.title,sub.user_id,sub.operation > FROM document doc, document_subscription sub > WHERE 6 = sub.user_id(+) AND sub.document_id(+) = doc.id; > > what does the '6 = sub.user_id(+)' condition exactly do in > this query? > how would this be translated SQL92 join syntax used by PostgreSQL? > > i've tried converting it to: > > SELECT doc.id,doc.title,sub.user_id,sub.operation > FROM document doc LEFT OUTER JOIN document_subscription sub > ON sub.document_id = doc.id > WHERE (sub.user_id = 6 OR sub.user_id IS NULL); > > but this query is missing the rows in the documents table which have a > corresponding document_subscription row with 'not user_id = 6'. >
Try this: SELECT doc.id,doc.title,sub.user_id,sub.operation FROM document doc LEFT OUTER JOIN document_subscription sub ON sub.document_id = doc.id AND sub.user_id = 6; Tambet ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
