Hi,

> I have already tried the 'rtfm', but it just didn't help.

But it's right there :)

  3.5.2 The Row Holding the Maximum of a Certain Column

> ..and I want to get this with a single query:

> +-----+--------+------+
> | key  | desc    | value |
> +-----+--------+------+
> |   2   | book    |       7 |
> |   6   | pen     |       7 |
> +-----+--------+------+

select key, desc, value
from your_table t1
where value = (select max(value) from your_table where desc = t1.desc)


Take care,
Aleksandar


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