additional conditions were true:...
> - result 1 ...the following extra conditions are requiredetc.
>
> Do you think this is feasible?
>
> Regards,
>
> John
>
>
>
>
>
> - Original Message -
> From: "Ignatius Reilly" <[EMAIL PROTECT
I guess I did not pay attention that day in class, but that is cool.
- Paul
-Original Message-
From: Ignatius Reilly [mailto:[EMAIL PROTECTED]
Sent: Friday, February 06, 2004 9:14 AM
To: DB list PHP; John
Subject: Re: [PHP-DB] Rules in a database
A bit of algebra first:
any
A bit of algebra first:
any expression formed of atomic expressions, AND, OR and parentheses can be
reduced to a "canonical" form, by using the De Morgan laws:
a AND ( b OR c ) is equiv. to a AND b OR a AND c
So a rule can eventually be reduced to "AND" groups, joined by "OR":
a(1) AND... AND a(n
