SELECT counts

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От Jayadevan M
Тема SELECT counts
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Msg-id OF3D569B61.E52FEDB0-ON65257767.003243F5-65257767.00330BFC@ibsplc.com
обсуждение исходный текст
Ответ на Re: Select only active entries  ("Carel Combrink" <s25291930@tuks.co.za>)
Ответы Re: SELECT counts  ("A. Kretschmer" <andreas.kretschmer@schollglas.com>)
Список pgsql-novice
Hello all,

I have a table with id and status_v.

create table myt (id integer, status_v varchar(10));
insert into myt values (1,'I');
insert into myt values (1,'P');
insert into myt values (1,'T');
insert into myt values (2,'P');

User gets counts of status records, filtered on some status_v like this
test=# select count(*), status_v from myt  where status_v in ('I','P','X')

group by status_v;
 count | status_v
-------+----------
     1 | I
     2 | P
(2 rows)

Is there a way in which I can have the output as
     1 | I
     2 | P
     0 | X

i.e., if there is not data, the count should be displayed as 0.

Regards,
Jayadevan





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