Re: [SQL] Aggregate functions, fast! (long)

[Ang Chin Han]

On Wed, Aug 09, 2000 at 02:53:45PM +0800, Ang Chin Han wrote:

> The queries making use of these might be rewritten as:
>   1.  select min(a) from t_sum; -- same as above, 
>                                 -- but we've less rows to scan
>   2.  select cnt from t_sum where a = 1 and b = 3;

Sorry, bugfix:
        select sum(cnt) from t_sum where a = 1 and b = 3;
  since c is not referenced.

>   3.  select sum(d * cnt) as sum from t_sum where a = 1 and c > 3;
>   4.  select sum(b * cnt) / cnt as avg from t_sum where c = 1;