| From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>, Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [SQL] how to change the type |
| Date: | 2001-12-07 21:41:46 |
| Message-ID: | 20011207132327.H38113-100000@megazone23.bigpanda.com |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-sql |
On Fri, 7 Dec 2001, Tom Lane wrote:
> Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> writes:
> > Going down is
> > problematic, because if you have a varchar(5) field where one value is say
> > 'abcd' and you make it varchar(3) what happens?
>
> What would actually happen right now is nothing: the value would still
> be 'abcd' and would still read out that way. The 3-char limit would
> only get enforced during inserts and updates of the column.
That's what I figured, but I also assume that'd be "wrong" in a pure sense
since the value is invalid for the new datatype, so I figure its safer
to say up only. :)
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