Dual look-up on keys?

[castironpi at gmail.com]

On Mar 5, 1:13 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> castiro... at gmail.com schrieb:
>
> > I want to hash values to keys.  How do the alternatives compare?
>
> http://catb.org/~esr/faqs/smart-questions.html

... without extending the whole way to a full relational database?