To create a database schema, you will need to use a database modelling program.

Magic Systems of Systems Architect (formerly called MagicDraw) is a very useful program for this - it allows you to create an abstract UML entity relation (ER) diagram in a class notation, and then transform it into a usable database diagram. Not only that, but you can also generate a script using code engineering sets based on your database diagram in several formats, which are designed to be compatible with a variety of DB administration frameworks, such as phpMyAdmin or Microsoft Access. These scripts can be used to import your database structure with all of the relations, field restrictions and constraints already implemented, without having to write any SQL code. However, Magic Systems of Systems Architect is not free, and commercial-use licenses can be pretty expensive. Some free alternatives include DBeaver and SchemaSpy, among others.

An example database schema for invoice tracking would contain the following entities and their attributes:

Customer
- Customer ID (Primary Key, unique identifier)
- Name
- Surname
- Address
- Phone number
- Email
- Other relevant customer information

Invoice
- Invoice ID (Primary Key, unique identifier)
- Customer ID (Foreign Key constraint, references the Customer entity)
- Invoice date
- Due date
- Amount
- Payment status (e.g., paid, overdue, etc.)

This schema should give you a good starting point for tracking customer invoices. You can also change the structure, as well as add other entities or attributes as necessary to support your requirements. For example, you could add a "Payment" entity to store information about payments made against each invoice, or you could add additional attributes to the "Invoice" entity to track discounts, taxes, or other details. If you would like for the customer to have an option of having several addresses, you can create a separate "Address" entity and connect it to the Customer entity with a 'one-to-many' relation.

Is there anything else I could help you with?
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