Обсуждение: Foreign key

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Foreign key

От
"Lorenzo De Vito"
Дата:
What's the best way to build a relation between two tables ?
I know that Foreign key is no longer supported.

RE: Foreign key

От
"Robby Slaughter"
Дата:
Uh...I think foreign keys are supported:
 
CREATE TABLE main
  ( id INTEGER,
    data TEXT );
 
CREATE TABLE secondary
  ( mainid INTEGER REFERENCES main(id),
    data TEXT );
 
That will make your joins:
 
 SELECT * FROM main,secondary WHERE id = mainid;
 
much more efficient.
 
-Robby
-----Original Message-----
From: pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org]On Behalf Of Lorenzo De Vito
Sent: Thursday, August 02, 2001 11:24 AM
To: pgsql-sql@postgresql.org
Subject: [SQL] Foreign key

What's the best way to build a relation between two tables ?
I know that Foreign key is no longer supported.

Re: Foreign key

От
Jason Earl
Дата:
Where did you get the idea that Foreign Key was no
longer supported?  It works fine on my 7.1.2 box:



processdata=> select version();                           version                          
---------------------------------------------------------------PostgreSQL 7.1.2 on i686-pc-linux-gnu, compiled by
GCC 2.95.4
(1 row)

processdata=> CREATE TABLE foo (tes_key varchar(5)
PRIMARY KEY);
NOTICE:  CREATE TABLE/PRIMARY KEY will create implicit
index 'foo_pkey' for table 'foo'
CREATE
processdata=> CREATE TABLE bar (bar_key SERIAL, foo_id
varchar(5) REFERENCES foo);
NOTICE:  CREATE TABLE will create implicit sequence
'bar_bar_key_seq' for SERIAL column 'bar.bar_key'
NOTICE:  CREATE TABLE/UNIQUE will create implicit
index 'bar_bar_key_key' for table 'bar'
NOTICE:  CREATE TABLE will create implicit trigger(s)
for FOREIGN KEY check(s)
CREATE

Good Luck,
Jason

--- Lorenzo De Vito <lorenzodevito@email.it> wrote:
> What's the best way to build a relation between two
> tables ?
> I know that Foreign key is no longer supported.
> 


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Re: Foreign key

От
Jan Wieck
Дата:
Lorenzo De Vito wrote:
> What's the best way to build a relation between two tables ?
> I know that Foreign key is no longer supported.
   Who told you so?


Jan

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