Re: count function alternative in postgres

Thanks Ben. It works fine.

Junaid.

Ben Morrow-2 wrote:
>
> Quoth junaidmalik14(at)gmail(dot)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
>
>
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