From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
---|---|
To: | Bhuvan A <bhuvanbk(at)yahoo(dot)com> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: how can we change definition of a table once created? |
Date: | 2001-07-09 06:46:03 |
Message-ID: | Pine.BSF.4.21.0107082343100.86282-100000@megazone23.bigpanda.com |
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Thread: | |
Lists: | pgsql-sql |
On Mon, 9 Jul 2001, Bhuvan A wrote:
> can any one say how can we change the table definition once
> created?
>
> say, we have a table with 1000s of records. if one needs
> to change the data type of particular column or if he
> needs to change the width of a column what should be
> done?
>
> As of now, i am copying the data to a file(COPY COMMAND) and
> creating a new table after deleting the old one and copying
> the content of that file to the new table.
>
> is it the only way to do it?
Not quite. Right now, you will need to make a new table, but
you can use alter table rename and insert ... select to make your
life a little easier... Something like:
create table new ... ;
insert into new (...) select ... from old;
alter table old rename to old_backup;
alter table new rename to old;
(drop old_backup when you're sure it's safe)
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