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Oracle reference many tables with one table

I have a number of solutions for this problem but want to choose the correct one and hope to hear a consensus of what experts think one having one table (Notes) which can have references to many tables.

So imagine you have a Company, User and Trade table.  Users belong to companies and trades belong to users which is all well laid out.  Now, I have to resolve the issue of how to resolve Notes because each of those tables can have notes.  So you can have notes for a person and/or company and/or trades.

What is the best way to implement this?

Oracle 12c with millions of rows per year with a minimum of 7 years activity.

Any help is GREATLY appreciated.

Thanks in advance,

B
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cyimxtck
Asked:
cyimxtck
1 Solution
 
johnsoneSenior Oracle DBACommented:
Single table:

NOTES
NOTE_ID       NUMBER
NOTE_TXT      VARCHAR2(4000)
CREATE_DATE   DATE

Primary key NOTE_ID.  Partition by CREATE_DATE to make truncating out notes easier.  I don't see a performance gain there because the date won't be part of any query.

If you need multiple fields, add a NOTE_SEQ field to sequence the records associated with the NOTE_ID.

All tables that have a note would have a foreign key to this table.

To drop out old notes,  you would have to update the NOTE_ID of the referencing tables to NULL and then drop the partition.
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cyimxtckAuthor Commented:
What I needed for sanity!
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