It's crude and not very efficient, but here is a solution:
CREATE TABLE temp ( var INT2 );
INSERT INTO temp VALUES (1);
etc.
CREATE FUNCTION temp_row_count() RETURNS FLOAT AS
'SELECT COUNT(*)::FLOAT AS result FROM temp'
LANGUAGE 'sql';
SELECT var, COUNT(*)::FLOAT / temp_row_count() AS pct
FROM temp GROUP BY var;
Hope this helps,
Clark
P.S. In oracle, I'd use a sub-query:
SELECT var, COUNT(*) / total_count
FROM temp,
( SELECT COUNT(*) AS total_count
FROM temp
)
GROUP BY var;
Sze Yuen Wong wrote:
>
> Hi,
>
> I need to calcuate the percentage from my table:
>
> var1
> ------
> 1
> 1
> 1
> 2
> 2
> 3
>
> Desire result:
>
> var1 | percentage
> ----------------------------
> 1 | 50%
> 2 | 33%
> 3 | 17%
>
> ===============================
>
> Any clue?
>
> Please help.
>
> Sze Wong
>
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