Please help me argh!!!!!!!

Question

I am using oracle version 8.
I'm doing an assignement (has to be in Friday 11th Jan)
I'm having real problems
I have 2 entities (obviously only part of my Entity Relationship Diagram) Cow and Herd. A herd could contain 1 or many cows but a cow could belong to a number of different herds.
This gives a many to many relationship so I added a link entity called Herd Member. Threfore the primary key of this entity is a composite key i.e. CowID and HerdID this is fine n I've created the table as follows
DROP TABLE herd_member CASCADE CONSTRAINTS;
CREATE TABLE herd_member(
     Cow_ID          Varchar2(20),
     Herd_ID          Varchar2(20),
Primary Key (Cow_ID,Herd_ID));
This is fine but how do I post Cow ID into another entity called Sale which has a foreign key called Cow_ID and thus create a master detail relationship??
Note it can't be done in the conventional manner e.g
CONSTRAINT fk_herd_member FOREIGN KEY (Cow_ID) references herd_member(Cow_ID));
Pleaseee help!!

Answer 1

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