Re: How ad an increasing index to a query result?

On 14 Oct 2009, at 19:05, Josip wrote:

> Hello,
>
> Could somebody please try to help me with this problem?

> I.e., I want to pick the 5 largest entries from table1 and show them
> alongside a new index column that tells the position of the entry. For
> example:
>
> a | b
> --------
> 82 | 5
> 79 | 4
> 34 | 3
> 12 | 2
> 11 | 1

Short of enumerating those results in your application, the easiest
approach is probably to wrap your query in a join with generate_series
like so:

SELECT a, s.b
FROM (
SELECT a
FROM table1
ORDER BY a DESC LIMIT 5
) AS t1, generate_series(5, 1, -1) AS s(b)

Alban Hertroys

--
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