Re: [GENERAL] 'a' == 'a '

> -----Original Message-----
> From: Tom Lane [mailto:tgl(at)sss(dot)pgh(dot)pa(dot)us]
> Sent: Thursday, October 20, 2005 2:54 PM
> To: Dann Corbit
> Cc: Richard_D_Levine(at)raytheon(dot)com; general(at)postgresql(dot)org; pgsql-
> hackers(at)postgresql(dot)org
> Subject: Re: [GENERAL] [HACKERS] 'a' == 'a '
>
> "Dann Corbit" <DCorbit(at)connx(dot)com> writes:
> > I guess that additional ambiguity arises if you add additional
spaces to
> > the end. Many database systems solve this by trimming the
characters
> > from the end of the string upon storage and the returned string will
not
> > have any trailing blanks.
>
> Can you document that? ISTM that that would effectively make char(n)
> and varchar(n) exactly equivalent, which is ... um ... a bit stupid.

This is SQL*Server:

drop table test_char
go
create table test_char(
fixed_30 char(30),
varch_30 varchar(30),
nchar_30 nchar(30),
nvarc_30 nvarchar(30)
)
go
insert into test_char values('Dann ', 'Dann ', 'Dann ', 'Dann ')
go
select len(fixed_30), len(varch_30), len(nchar_30), len(nvarc_30)
from test_char
go

Result set:
4 4 4 4