not grokking outer joins...
От | will trillich |
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Тема | not grokking outer joins... |
Дата | |
Msg-id | 20010820233346.A12955@serensoft.com обсуждение исходный текст |
Ответы |
Re: not grokking outer joins...
|
Список | pgsql-general |
i'm trying to wrap outer joins around my cerebellum: CUST: id serial name varchar(30) ITEM: cust integer references cust (id) data varchar(30) INFO: cust integer references cust (id) stuff text for my query i'd like, for every customer, to have item.* show up if it exists, and info.* show up if it exists... select CUST.name, ITEM.data, INFO.stuff from CUST left join ITEM on (CUST.id=ITEM.cust), CUST left join INFO on (CUST.id=INFO.cust) .... not! or does this need some subselect magic? and (separate question) is there a way to be sure that ONE or the OTHER or BOTH have joinable data, but don't show CUST if neither ITEM nor INFO has a match? foreach CUST if ITEM matches show record elsif INFO matches show record else -- neither matches dont show squat, not even from cust end if end foreach -- Khan said that revenge is a dish best served cold. I think sometimes it's best served hot, chunky, and foaming. - P.J.Lee ('79-'80) will@serensoft.com http://sourceforge.net/projects/newbiedoc -- we need your brain! http://www.dontUthink.com/ -- your brain needs us!
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