Re: Which is faster: char(14) or varchar(14)

On Tue, Dec  4, 2012 at 11:44:20AM -0200, Edson Richter wrote:
> I think I already know the answer (char(14)), but I would like to
> confirm: which is faster?
>
> In Brazil, company id has 14 digits (12 identifiers, 2 control
> digits). By today, application use varchar(14) for these, but I
> intend to optimize insert/update/delete and search, and I'm
> considering to change it to char(14).
>
> Will it give ANY gain? I do use equality and like operators for search.

You need to test it but I doubt there would be any measurable
difference.  If it will always be 14, I would use char(14), and perhaps
use a CHECK constraint to make sure it is always 14 with spaces.

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +