You shouldn't be entering data into tables directly, unless maybe you have a complete understanding of db normalization and related records. Sometimes even then it is not advisable, and sometimes not possible. You should be doing this via forms. Based on your post, there is no relationship between the two tables you've added data to. If you insist on entering data this way, your relationships should include Cascade deletes and updates, but this is risky.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.