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.

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