Single Foreign Key Referencing Multiple Columns in Same Table

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Can a primary key of one table be a foreign key in another table more than one time. Please see the scenario below:

Table:1
id (pk)
title
referenceID (FK)
oldreferenceID (FK)

Delphi

Table:2
referenceID (PK)
referenceTitle

Here, can i use "Table:2 referenceID (PK)" as foreign key in "Table:1 referenceID (FK) & oldreferenceID (FK) ?"

Please advise. Thanks in advance.

Posted 27-Oct-13 0:48am

adnanrazzaqq

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abbaspirmoradi 27-Oct-13 7:05am

you should do this with triggers.

adnanrazzaqq 27-Oct-13 7:06am

can you please brief how?

3 solutions

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phil.o · Answer 1 · 2013-10-27T01:03:00

Solution 1

Yes, it is absolutely valid, a table can reference the same primary key in several columns.

Posted 27-Oct-13 1:03am

phil.o

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adnanrazzaqq 27-Oct-13 7:08am

Hi! Phil, can you please reference any particular link/tutorial.

OriginalGriff · Answer 2 · 2013-10-27T01:06:00

Solution 2

Yes. It's pretty normal - think of addresses for example: a company may have a Billing address and a Delivery Address. You would only store each address once, and use Foreign Key references to attach them to the single company. Each address would have a distinct Primary Key.

Posted 27-Oct-13 1:06am

OriginalGriff

abbaspirmoradi · Answer 3 · 2013-10-27T02:16:00

Solution 3

This maybe help you :

http://stackoverflow.com/questions/18248366/trigger-on-delete-on-update-for-table-with-many-columns-that-reference-to-one-co[^]

Posted 27-Oct-13 2:16am

abbaspirmoradi