From: | wd <wd(at)wdicc(dot)com> |
---|---|
To: | PostgreSQL General <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Group by bug? |
Date: | 2012-12-28 07:26:00 |
Message-ID: | CABexzmg9oyVvTra0BZx7TzP7YDuOgmUVLtS8-z1b_+yYOB816A@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general |
Sorry, forget to say,
PostgreSQL 9.2.2 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.4.6
20110731 (Red Hat 4.4.6-3), 64-bit
psql (9.2.2)
On Fri, Dec 28, 2012 at 3:24 PM, wd <wd(at)wdicc(dot)com> wrote:
> hi,
>
> wd_test=# \d t1
> Table "public.t1"
> Column | Type | Modifiers
> --------+---------+-------------------------------------------------
> id | integer | not null default nextval('t1_id_seq'::regclass)
> tag | text |
>
> wd_test=# select * from t1;
> id | tag
> ----+-----
> 1 | a
> 2 | a
> 3 | b
> 4 | c
> 5 | b
> (5 rows)
>
> ---- this sql will not group by the case result.
> wd_test=# select case t1.tag when 'a' then '1' else '0' end as tag,
> count(*) from t1 group by tag;
> tag | count
> -----+-------
> 0 | 1
> 0 | 2
> 1 | 2
> (3 rows)
>
> ---- this sql will group by the case result.
> wd_test=# select case t1.tag when 'a' then '1' else '0' end as ttag,
> count(*) from t1 group by ttag;
> ttag | count
> ------+-------
> 0 | 3
> 1 | 2
> (2 rows)
>
From | Date | Subject | |
---|---|---|---|
Next Message | Jov | 2012-12-28 07:47:55 | Re: Group by bug? |
Previous Message | wd | 2012-12-28 07:24:23 | Group by bug? |