Re: [HACKERS] Enhancing PGSQL to be compatible with Informix SQL
От | Bruce Momjian |
---|---|
Тема | Re: [HACKERS] Enhancing PGSQL to be compatible with Informix SQL |
Дата | |
Msg-id | 200001061916.OAA16888@candle.pha.pa.us обсуждение исходный текст |
Ответ на | Re: [HACKERS] Enhancing PGSQL to be compatible with Informix SQL (The Hermit Hacker <scrappy@hub.org>) |
Список | pgsql-hackers |
> > Yes, OUTER is an Informix-ism. Oracle uses *=. I think the first is > > easier to add and makes more sense for us. *= could be defined by > > someone as an operator, and overloading our already complex operator > > code to do *= for OUTER may be too complex for people to understand. > > > > It would be: > > > > SELECT * > > FROM tab1, OUTER tab2 > > WHERE tab1.col1 = tab2.col2 > > What about >2 table joins? Wish I had my book here, but I though tyou > could do multiple OUTER joins, no? SELECT * FROM tab1, OUTER tab2, OUTER tab3 WHERE tab1.col1 = tab2.col2 AND tab1.col3 = tab3.col3 My assumption is that you can't join tab2 to tab3 becaue tab2 is already outer, but I don't know. -- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610) 853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania19026
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