Re: Add column and specify the column position in a table - Mailing list pgsql-sql

From Guillaume Lelarge
Subject Re: Add column and specify the column position in a table
Date
Msg-id d854adec0605180954t2f546e21u991832bca7469bef@mail.gmail.com
Whole thread Raw
In response to Re: Add column and specify the column position in a table  (Andrew Sullivan <ajs@crankycanuck.ca>)
List pgsql-sql
2006/5/18, Andrew Sullivan <ajs@crankycanuck.ca>:
> On Thu, May 18, 2006 at 05:43:19PM +0200, Guillaume Lelarge wrote:
> > Do you mean that, using "alter table test add column" with the "after"
> > option, MySQL creates a new table, populates it with the old table
> > data and finally drops the old table ? I mean, there's the same
> > performance problem with big tables ?
>
> MySQL does that for a great deal of its DDL.  Yes, the performance is
> awful for this on big tables.
>
> The reason I didn't answer the OP's question, though, is that I can't
> think of a legitimate reason to do this anyway.  The physical layout
> of the columns should not be of concern to the developer, who should
> be naming the columns anyway.
>

I totally agree on the physical layout. Just being curious :)


--
Guillaume.


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