Management fitness club

he gym has many clients. each client has a name, registration date, expiration date and a single unique phone number.

every client can pay several bills. we keep track of the bills that the clients pay. we can also check if a client's subscription has expired or not

. each bill has it's own price, date, period and the amount of payment a client wants to pay.

we also keep track of the received and the residual payments of the client.

- a client may pay several bills but two clients can't pay the same bill - each client must

have a single unique phone number - the client's have a unique composite name consists of first name, last name.