Re: By The Dawn's Normal Light

From: Alfredo Novoa <anovoa_at_ncs.es>
Date: Sun, 24 Oct 2004 04:40:28 +0200
Message-ID: <5g5mn0p8fq179i3nuqr6turib1ei1fhth8_at_4ax.com>


On 22 Oct 2004 12:37:47 -0700, tonyisyourpal_at_netscape.net (Tony Douglas) wrote:

>> select * from a where b like 'Z%';
>>
>> select * from x where a[1][2] = 5;
>>
>
>What do you mean here by "type operators" ?

Scalar operators.

I don't think that "type operators" is a very good term.

>> This is not true, the type operators are a fundamental part of the
>> "relational engine"
>
>I don't think so; what the relational engine needs is knowledge of the
>existence of a set of types, and a set of operators on those types
>that return boolean values, so that it can compute those functions
>over attributes in a join or restrict.

The boolean type is fundamental to the "relational engine" and sets of 1 are also sets.

Regards Received on Sun Oct 24 2004 - 04:40:28 CEST

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