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Re: mysql command equivalents?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Hassan Schroeder <hassan(dot)schroeder(at)gmail(dot)com>
Cc: pgsql-novice(at)postgresql(dot)org
Subject: Re: mysql command equivalents?
Date: 2009-10-13 22:25:15
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Lists: pgsql-novice
Hassan Schroeder <hassan(dot)schroeder(at)gmail(dot)com> writes:
> On Tue, Oct 13, 2009 at 2:50 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Note that practically all clients do offer that functionality easily
>> --- for instance, in psql it's "\c databasename". But without knowing
>> what client code you're using it's hard to offer advice.

> Thanks, that's what I was looking for. And yes, my bad for not
> specifying I was using 'psql' -- didn't realize there was more than
> one command-line interface. (Are those listed anywhere?)

Not sure there is more than one, but there are certainly GUI clients,
such as pgAdmin.

>> Also, as Richard noted, mysql's "databases" are really closer to pgsql's
>> "schemas".

> Sorry, can you expand on that, or give me a pointer to an explanation?
> If a pgsql schema is the equivalent of a mysql database, what's a pgsql
> "database"? Why would you choose one over the other?

AFAIK mysql doesn't have anything that directly corresponds to a PG
database.  In PG, a database is a separate set of system catalogs.
There is some infrastructure it shares with other databases in the
same installation, but not much.  If you have a table in one database,
it is simply not possible to get at it while connected to a different
database.  This is unlike schemas, which are just a naming hierarchy.
If you're accustomed to doing "select * from" to get at a
table named bar in a mysql database named foo, you'd want to handle
that in PG by setting up a schema named foo.  So in that context,
"USE something" corresponds to "SET search_path = something", just
as Richard suggested.

Usually you'd use a separate database for an application or user
that you want to keep pretty well insulated from others.

			regards, tom lane

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