>>Am I stuck adding a column for every table I may want to point to? If

so, then

>>I can't set the field as NOT NULL to make sure a relationship always

exists.

> Your last statement is a little confusing.

I must point to at least one table. Currently, with only one table to
point to I just have a not-null foreign key.

> BTW, how many tables are you referring to?

It's always been one, which was simple. After lobbying from Sales,
we're supporting two. Now that there is nothing preventing more than
one, there are going to be many more requests in the coming months to
add special features for various current and potential clients.

-----Original Message-----
From: firebird-support@yahoogroups.com
[mailto:firebird-support@yahoogroups.com] On Behalf Of Leyne, Sean
Sent: Wednesday, May 26, 2010 5:26 PM
To: firebird-support@yahoogroups.com
Subject: RE: [firebird-support] Many to many (tables) relationship

> I have to represent a relationship between a result set which is

stored as a

> row in a table, and a row of static parameters that were used in the

algorithm

> that produced the result.
> The problem is that the single row of values is chosen from among many
> tables. So I can't just use a foreign key pointing from the result to

the

> parameters. I can't use a junction table either, as this is to many

_tables_ not

> many rows.
>
> Am I stuck adding a column for every table I may want to point to? If

so, then

> I can't set the field as NOT NULL to make sure a relationship always

exists.

Your last statement is a little confusing.

Unless the result rows "must be related to" one entry from each of the
possible tables, there is no need for the "relationship always exists".

BTW, how many tables are you referring to?


Sean



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