From: | Joe Conway <mail(at)joeconway(dot)com> |
---|---|
To: | Mikael Carneholm <SA9625(at)ida(dot)utb(dot)hb(dot)se> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Shema functionality in 7.3 |
Date: | 2002-12-02 01:53:09 |
Message-ID: | 3DEABD05.5010804@joeconway.com |
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Lists: | pgsql-general |
Mikael Carneholm wrote:
> Can someone who has experience from the new 7.3 version tell me
> if
>
> SELECT tableA.foo
> FROM shema1.tableA, shema2.tableB
> WHERE tableA.bar = tableB.bar
>
> is possible thanks to the new schema functionality?
Like this?
CREATE SCHEMA schema1;
CREATE SCHEMA schema2;
CREATE TABLE schema1.table_a(bar int, foo text);
INSERT INTO schema1.table_a VALUES(1,'a');
INSERT INTO schema1.table_a VALUES(2,'b');
CREATE TABLE schema2.table_b(bar int, foo text);
INSERT INTO schema2.table_b VALUES(1,'c');
INSERT INTO schema2.table_b VALUES(2,'d');
regression=# SELECT t1.foo, t2.foo FROM schema1.table_a t1, schema2.table_b t2
WHERE t1.bar = t2.bar;
foo | foo
-----+-----
a | c
b | d
(2 rows)
> And is it possible to grant users permissions on whole schemas?
Not sure exactly what you mean, but see:
http://developer.postgresql.org/docs/postgres/sql-createschema.html
http://developer.postgresql.org/docs/postgres/sql-grant.html
> Queries like the one above is possible in Oracle, and I would really
> like to see this in PostgreSQL as well. (I guess we could call this
> feature "cross schema joins".)
>
> Note: I would not consider this as crossdb functionality, as tableA
> and tableB exist in the same database (using Oracle terms: the
> same instance), but in different shemas.
>
It's not the same as a cross db join, but the ability to use schemas is hoped
to reduce the need for that. You should look at contrib/dblink if you want to
join data across databases or servers.
HTH,
Joe
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