| From: | Gregory Stark <stark(at)enterprisedb(dot)com> |
|---|---|
| To: | "Andreas" <maps(dot)on(at)gmx(dot)net> |
| Cc: | "PostgresSQL list" <pgsql-sql(at)postgresql(dot)org> |
| Subject: | Re: percentages of a column |
| Date: | 2007-06-30 04:15:43 |
| Message-ID: | 87ved6krgw.fsf@oxford.xeocode.com |
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| Lists: | pgsql-sql |
"Andreas" <maps(dot)on(at)gmx(dot)net> writes:
> Example:
>
> Fruit Count %
> --------------------------
> Bananas 5 10%
> Apples 15 30%
> Oranges 30 60%
select fruit_name, count(*),
round(count(*)::numeric / (select count(*) from basket) * 100, 0)::text||'%' as "%"
from basket
group by fruit_name
order by "%";
fruit_name | count | %
------------+-------+-----
Bananas | 5 | 10%
Apples | 15 | 30%
Oranges | 30 | 60%
(3 rows)
--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
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