Re: outer joins
От | Poet/Joshua Drake |
---|---|
Тема | Re: outer joins |
Дата | |
Msg-id | Pine.LNX.4.30.0104040748550.17698-100000@crazypenguins.commandprompt.com обсуждение исходный текст |
Ответ на | outer joins (Algirdas Šakmanas <asakmanas@grafton.lt>) |
Список | pgsql-sql |
Hello, I believe these are supported in 7.1 On Wed, 4 Apr 2001, [iso-8859-4] Algirdas ©akmanas wrote: >Hi all, > >I'm new to postgre, I've changed my work and consequently now i'm moving >from MS plaform. >In MS SQL there are such constructs left or right outer join, in postgres >there are no such thing > >Can You offer me strategy to make query that selects from table (a) and >joins to it another (b) >on e.g. a.id=b.aid but joins so that in case there is no value in table b >NULL is left in result: >in MS SQL i've used query: > >select a.id, b.name from a left outer join b on a.id=b.aid > >table a table b > >id | aid | name >----------- ---------------- >1 1 | Tom >2 3 | Sam > >result: >a.id | b.name >--------------------- >1 | Tom >2 | NULL > >thank you in advance > >Algirdas ©akmanas >IT manager >+370 99 90369 >asakmanas@grafton.lt >Grafton Entertainment >http://www.tvnet.lt > > > >---------------------------(end of broadcast)--------------------------- >TIP 2: you can get off all lists at once with the unregister command > (send "unregister YourEmailAddressHere" to majordomo@postgresql.org) > -- -- <COMPANY>CommandPrompt - http://www.commandprompt.com </COMPANY> <PROJECT>OpenDocs, LLC. - http://www.opendocs.org </PROJECT> <PROJECT>LinuxPorts - http://www.linuxports.com </PROJECT> <WEBMASTER>LDP - http://www.linuxdoc.org </WEBMASTER> -- Instead of asking why a piece of software is using "1970s technology," start asking why software is ignoring 30 years of accumulated wisdom. --
В списке pgsql-sql по дате отправления: