Re: count function alternative in postgres

Thanks Ben. It works fine.

Junaid.


Ben Morrow-2 wrote:
> 
> Quoth junaidmalik14@gmail.com (junaidmalik14):
>> 
>> Is there any alternative of mysql function COUNT(DISTINCT expr,[expr...])
>> in
>> postgres. We get error if we 
>> 
>> write count like this count(distinct profile.id, profile.name,
>> profile.age)
>> but it works well in mysql.
> 
> Pg does support COUNT(DISTINCT ), but only for a single column. The best
> I can come up with for multiple columns is
> 
>     select count(distinct profile.tuple) from
>         (select (id, name, age) as tuple from profile)
>             as profile;
> 
> or alternatively
> 
>     select count(*) from
>         (select distinct (id, name, age) as tuple from profile)
>             as profile;
> 
> Ben
> 
> 
> -- 
> Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-sql
> 
> 

-- 
View this message in context: http://old.nabble.com/count-function-alternative-in-postgres-tp28126792p28339793.html
Sent from the PostgreSQL - sql mailing list archive at Nabble.com.