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From: Marius Amado Alves <amado.alves@netcabo.pt>
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Subject: Re: Windows Ada database support.
Date: Mon, 29 Nov 2004 15:58:52 +0000
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Date: 2004-11-29T15:58:52+00:00

Frank Piron wrote:
> Base Predicates(Tables): Person(x,s), Parent(x,y)     |(s = sex)
> Show all Fathers:
> 
> LQL:
> Father(x):=E(y)[Person(x,s) and
>                 s='MALE'    and
>                 Parent(x,y)
>                 ]
> 
> SQL:
> select Person.x
>      from Person, Parent
>       where Person.s='MALE' and
>             Person.x = Parent.x   (inner join for the E-Quantifier)

In Mneson you would represent the parent, or child, relation simply as 
an attribute of a person, and then write something like

   targets (Person) ^ having (s, MALE) ^ having_any (child)

For robust validation of query languages I found two data sets:

- the ones included in XQuery published by w3c.org
- the benchmarks published by tpc.org

Maybe there are others; I'd like to know.