Re: outer joins

Поиск
Список
Период
Сортировка
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:

Предыдущее
От: The Hermit Hacker
Дата:
Сообщение: [7.0.3] optimizing a LIKE query ...
Следующее
От: "Picard, Cyril"
Дата:
Сообщение: RE: outer joins