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* Inserting data in a table using sub-selects
@ 2004-03-10 19:52 Andreas Joseph Krogh <andreak@officenet.no>
0 siblings, 1 reply; 4+ messages in thread
From: Andreas Joseph Krogh @ 2004-03-10 19:52 UTC (permalink / raw)
To: pgsql-sql
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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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^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Inserting data in a table using sub-selects
@ 2004-03-10 20:49 Stephan Szabo <sszabo@megazone.bigpanda.com>
parent: Andreas Joseph Krogh <andreak@officenet.no>
0 siblings, 0 replies; 4+ messages in thread
From: Stephan Szabo @ 2004-03-10 20:49 UTC (permalink / raw)
To: Andreas Joseph Krogh <andreak@officenet.no>; +Cc: pgsql-sql
On Wed, 10 Mar 2004, 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);
I think you mostly just want to remove the values():
Insert into table2(id, content) select t1.id, coalesce(t1.title, '')
|| ' ' || coalesce(t1.description, '') as content from table t1;
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Inserting data in a table using sub-selects]
@ 2004-03-10 20:56 Marty Scholes <marty@outputservices.com>
0 siblings, 1 reply; 4+ messages in thread
From: Marty Scholes @ 2004-03-10 20:56 UTC (permalink / raw)
To: pgsql-sql
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
> -----BEGIN PGP SIGNATURE-----
> 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
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Inserting data in a table using sub-selects]
@ 2004-03-10 22:33 Andreas Joseph Krogh <andreak@officenet.no>
parent: Marty Scholes <marty@outputservices.com>
0 siblings, 0 replies; 4+ messages in thread
From: Andreas Joseph Krogh @ 2004-03-10 22:33 UTC (permalink / raw)
To: Marty Scholes <marty@outputservices.com>; +Cc: pgsql-sql
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On Wednesday 10 March 2004 21:56, Marty Scholes wrote:
> 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.
Thanks, works perfectly.
- --
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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^ permalink raw reply [nested|flat] 4+ messages in thread
end of thread, other threads:[~2004-03-10 22:33 UTC | newest]
Thread overview: 4+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2004-03-10 19:52 Inserting data in a table using sub-selects Andreas Joseph Krogh <andreak@officenet.no>
2004-03-10 20:49 ` Stephan Szabo <sszabo@megazone.bigpanda.com>
2004-03-10 20:56 Re: Inserting data in a table using sub-selects] Marty Scholes <marty@outputservices.com>
2004-03-10 22:33 ` Re: Inserting data in a table using sub-selects] Andreas Joseph Krogh <andreak@officenet.no>
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