Обсуждение: text & char(32)

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text & char(32)

От
"Vladimir V. Zolotych"
Дата:
  Hi all,
Can you help me a bit ?
The question is: how can I compare TEXT and CHAR(32) types ?
More detailed description:
  my=> create table foo (tt text, cc char(32));

  CREATE
  my=> insert into foo values ('aa', 'ab');

  INSERT 27476810 1
  my=> insert into foo values ('aa', 'aa');

  INSERT 27476811 1
  my=> select * from foo where tt=cc;

  tt|cc
  --+--
  (0 rows)
So the operator '=' doesn't work as I expected.
Any help will be appreciated.

--
Best regards,
 Vladimir                          mailto:gsmith@eurocom.od.ua

Re: text & char(32)

От
Herbert Ambos
Дата:
On Tue, 19 Sep 2000, Vladimir V. Zolotych wrote:

>   Hi all,
> Can you help me a bit ?
> The question is: how can I compare TEXT and CHAR(32) types ?
> More detailed description:
>   my=> create table foo (tt text, cc char(32));
>
>   CREATE
>   my=> insert into foo values ('aa', 'ab');
>
>   INSERT 27476810 1
>   my=> insert into foo values ('aa', 'aa');
>
>   INSERT 27476811 1
>   my=> select * from foo where tt=cc;
>
>   tt|cc
>   --+--
>   (0 rows)
> So the operator '=' doesn't work as I expected.
> Any help will be appreciated.
>
>

try

    select * from foo where tt=trim(cc);



herbert

Re: text & char(32)

От
Karel Zak
Дата:
On Tue, 19 Sep 2000, Vladimir V. Zolotych wrote:

>   Hi all,
> Can you help me a bit ?
> The question is: how can I compare TEXT and CHAR(32) types ?
> More detailed description:
>   my=> create table foo (tt text, cc char(32));
>
>   CREATE
>   my=> insert into foo values ('aa', 'ab');
>
>   INSERT 27476810 1
>   my=> insert into foo values ('aa', 'aa');
>
>   INSERT 27476811 1
>   my=> select * from foo where tt=cc;
>
>   tt|cc
>   --+--
>   (0 rows)

 Because you not compare 'aa' and 'aa' but

    'aa' and 'aa                    '
                  ^^^^^^^^^^^^^^^^^^^^^^
               32 chars

 try:

 test=# select * from foo where tt::char = cc;
 tt |                cc
----+----------------------------------
 aa | aa
(1 row)

 Better is use varchar(32) for 'cc' if you want run this (tt=cc) query
often.

                Karel

Re: text & char(32)

От
bangh
Дата:
If your define your table using varchar(32), instead of char(32), your
query will work fine.


--
banghe

Herbert Ambos wrote:

> On Tue, 19 Sep 2000, Vladimir V. Zolotych wrote:
>
> >   Hi all,
> > Can you help me a bit ?
> > The question is: how can I compare TEXT and CHAR(32) types ?
> > More detailed description:
> >   my=> create table foo (tt text, cc char(32));
> >
> >   CREATE
> >   my=> insert into foo values ('aa', 'ab');
> >
> >   INSERT 27476810 1
> >   my=> insert into foo values ('aa', 'aa');
> >
> >   INSERT 27476811 1
> >   my=> select * from foo where tt=cc;
> >
> >   tt|cc
> >   --+--
> >   (0 rows)
> > So the operator '=' doesn't work as I expected.
> > Any help will be appreciated.
> >
> >
>
> try
>
>         select * from foo where tt=trim(cc);
>
> herbert