Odp: [PHP-DB] <PK><FK>
| From: | Jarek Zgoda | Date: | Wed, 24 Jan 2001 06:38:40 +0000 |
| Subject: | Odp: [PHP-DB] <PK><FK> | ||
| References: | 1 | Groups: | php.db |
| Request: | Send a blank email to php-db+get-6123@lists.php.net to get a copy of this message | ||
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Temat: Re: [PHP-DB] <PK><FK>
> However, the answer about needing to define a PK before you can use it as
a
> FK being a limitation of SQL may have been a bit misleading (sorry,
Jarek).
> It is more of a building block of relational theory rather than a
> limitation of SQL.
It depends from POW: for database designer it's a part of RDB theory, but
for programmer it's a limitation. That's why programmers need CASE tools ;-)
Cheers
Jarek