Re: columns for count histograms of values

--- Alexy Khrabrov <deliverable(at)gmail(dot)com> wrote:

> Greetings -- I have a table of the kind
>
> Ratings:
> id integer
> rating smallint
>
> -- where value can take any value in the range 1 to 5. Now I want to
>
> have a statistical table Stats of the form
>
> id integer
> min smallint
> max smallint
> avg real
> r1 integer
> r2 integer
> r3 integer
> r4 integer
> r5 integer
>
> -- how can I create it in one pass over Ratings?

select id, min(rating), max(rating), avg(rating),
sum( case rating = 1 then 1 else 0 end ),
...

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