three table join

Dear Group,
I have two tables 1. Contacts and 2. Experiment.

I have another link table con_exp_link table.

Contacts
Con_id
con_fname
con_lname
con_address


Experiment
exp_id
exp_name
exp_scientist
exp_publication.



con_exp_link
con_exp_id
con_id
exp_id


In this link table I have nothing but primary keys of
experiment and contacts table.


Now my question:

How can I fill the link table. I am highly confused.

Can any one help me please.

thanks

kumar.




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