Re: which one is faster - Mailing list pgsql-performance

2010/10/26 Szymon Guz <mabewlun@gmail.com>:

>
> Well, strange. Why is that slower?

To answer that fully, you would need to see the implementation.
suffice to say,

count(a) does:

if (a <> NULL)
{
 count++;
}

and count(*) does:

 count++;