From: Marty Scholes <marty@outputservices.com>
To: pgsql-sql <pgsql-sql@postgresql.org>
Subject: Re: Inserting data in a table using sub-selects]
Date: Wed, 10 Mar 2004 13:56:46 -0700
Message-ID: <404F810E.1010707@outputservices.com> (raw)
INSERT INTO table2 (id, content) (
SELECT id, coalesce(title, '') || ' ' || coalesce(description, '')
FROM table1 t1);
If you want to keep them syncrhonized, in other words, rerun the query
over and over again without having to truncate table2 first or deleting
all of the rows, you can:
INSERT INTO table2 (id, content) (
SELECT id, coalesce(title, '') || ' ' || coalesce(description, '')
FROM table1 t1)
WHERE id NOT IN (
SELECT id
FROM table1);
With Oracle there is a slick way to do a partial outer join that allowed
you to do this without creating a complete list of table1.id in the last
subquery, but I dunno if Pg has an equivalent mechanism.
Andreas Joseph Krogh wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi, I'd like to fill one table with the contents of another table.
Mye schema
> is like this:
>
> CREATE TABLE table1(
> id serial NOT NULL PRIMARY KEY,
> title varchar NOT NULL,
> description varchar
> );
>
> CREATE TABLE table2(
> id int NOT NULL REFERENCES(table1(id) ON DELETE CASCADE,
> content varchar NOT NULL
> );
>
> Now - is there a way I can do something like:
> INSERT INTO table2(id, content) values (select t1.id,
coalesce(t1.title, '')
> || ' ' || coalesce(t1.description, '') as content from table1 t1);
>
> Any hints on how to insert a lot of values at the same time like this?
>
> - --
> Andreas Joseph Krogh <andreak@officenet.no>
> Managing Director, Senior Software Developer
> OfficeNet AS
>
> I always do a CVS update before making a patch (unless I forget).
>
> gpg public_key: http://dev.officenet.no/~andreak/public_key.asc
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> Version: GnuPG v1.2.2 (GNU/Linux)
>
> iD8DBQFAT3H1UopImDh2gfQRAsa6AJ9jZjNz25w4iVnxNJYY9LJuG0HBLACfZfup
> 1TMzQSi1+YYgNjpcampX6wo=
> =fJA3
> -----END PGP SIGNATURE-----
>
> ---------------------------(end of broadcast)---------------------------
> TIP 7: don't forget to increase your free space map settings
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To: pgsql-sql@postgresql.org
Cc: marty@outputservices.com
Subject: Re: Inserting data in a table using sub-selects]
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