Question

We design this database to track our customer database but I feel it is little complicated design I feel it can be more simple can someone give some advice for design?

Answer 1

If simplicity is the key point here, I’d suggest you collapse your customer-related address type information into a single table like so :

    customer_contact_details{
    customer_id MEDIUM_INT
    contact_type VARCHAR2(10)
    contact_details VARCHAR2(100)
    status BOOLEAN
    }

The contact_type field can then be tagged as Home Phone,email,primary_email,work_phone,primary contact depending on your needs. You can then have all such related contact information in a single table. Streamlines your schema and you need only a single join to make sense of the info.