adding fields to a table
Hello,
I have a table with a bunch of records already inserted. When I want to add or remove fields from the, what I've done is produce an sql file, add the fields to the create table directive, and add the fields manually to each record to be inserted. Then I do an
\i db_name
which destroys all the tables and records and then recreates them. I'm wondering if there's a better way. Namely, I alter the table using psql, which I know can be done. What I'm not sure about is whether altering the table will also alter the records, or will the records inserted previous to the alter table be out of sync with the table.
Thanks for your advice.
Mark
ALTER TABLE ADD COLUMN
On Thu, Jun 26, 2003 at 12:42:18PM -0400, MT wrote:
Hello,
I have a table with a bunch of records already inserted. When I want to add or remove fields from the, what I've done is produce an sql file, add the fields to the create table directive, and add the fields manually to each record to be inserted. Then I do an
\i db_name
which destroys all the tables and records and then recreates them. I'm wondering if there's a better way. Namely, I alter the table using psql, which I know can be done. What I'm not sure about is whether altering the table will also alter the records, or will the records inserted previous to the alter table be out of sync with the table.
Thanks for your advice.
Mark
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However you cannot currently remove a column...
Oh yes you can:
ALTER TABLE tbl DROP COLUMN whatever
http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&fil
e=ddl-alter.htmlIIRC it was introduced fairly recently (7.3?)
Doh! Really should get rid of 'Practical PostgreSQL' as my point of
reference, only covers 7.1.x... Come on O'Reilly, print a second edition!
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On Fri, Jun 27, 2003 at 09:53:38 +0100,
Benjamin Jury <benjamin.jury@mpuk.com> wrote:
Doh! Really should get rid of 'Practical PostgreSQL' as my point of
reference, only covers 7.1.x... Come on O'Reilly, print a second edition!
I find the online docs are pretty useful for checking for this kind of thing.
My main problem is I am getting used to what is available in CVS and don't
always remember what isn't in earlier releases.