I would like to set up a DB table which should contain the id's of another table. This info (id) are placed in just one table cell. What shall I do?

To be more specific: there's a table called "developers". There should be info like email, name, his skills, and the id's in which this developer has participated. The project's table of course is already existing.

So when the visitor loads this developer's page, he should get a list of projects which this corresponding developer has joined.

Thanks for any help!