Обсуждение: How to select from many database ??

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How to select from many database ??

От
Art - Feping
Дата:
i want to select from many databases, for example , i want to select table
master in database  A, and table master in database B. 
can i do it like this :   " select * from  A.Master, B.Master "  just like
in SQL Server ??
or can somebody help me how to select many database in postgresSQL ?? Thank
u....



Re: How to select from many database ??

От
Michael Fuhr
Дата:
On Tue, Apr 19, 2005 at 10:13:52AM +0700, Art - Feping wrote:
>
> i want to select from many databases, for example , i want to select table
> master in database  A, and table master in database B. 
> can i do it like this :   " select * from  A.Master, B.Master "  just like
> in SQL Server ??

PostgreSQL doesn't directly support queries to multiple databases,
but see contrib/dblink for a way to do it.  See also the third-party
dbi-link module.

http://pgfoundry.org/projects/dbi-link

-- 
Michael Fuhr
http://www.fuhr.org/~mfuhr/


Re: How to select from many database ??

От
Christopher Browne
Дата:
Oops! Feping@artindo.co.id (Art - Feping) was seen spray-painting on a wall:
> i want to select from many databases, for example , i want to select table
> master in database  A, and table master in database B. 
> can i do it like this :   " select * from  A.Master, B.Master "  just like
> in SQL Server ??
> or can somebody help me how to select many database in postgresSQL ?? Thank
> u....

There is a module called "dblink" in the contrib area that can do
this.  You obviously don't get to maintain all the "goodies" of
integrity constraints and MVCC 'synchronization' of data.

If you find you have applications where you are accessing multiple
databases like this, you should consider whether or not they could
perhaps be joined into one database by putting the data into several
namespaces or schemas.

That _may_ not be possible, but it's worth investigating, as it is
likely to be _way_ more efficient...
-- 
let name="cbbrowne" and tld="gmail.com" in name ^ "@" ^ tld;;
http://linuxfinances.info/info/lsf.html
PASCAL  is  not  a  language.  It  was  an  experiment  combining  the
flexibilty of  C with that  of a drug-crazed  penguin. It is  also the
'language' of choice  of many CS professors who  aren't up to handling
REAL programming. Hence, it is not a language.