DB design : save different details of payment (credit or check)

Question

I have a member that can pay in three different ways:

1. credit card
2. check
3. transfer from bank account

How can I design a table t

Answer 1

Store all income in a Payments table. Each Payment specifies a payment method from the PaymentMethods table and is related to an order in the Orders table.

In the past I stored payment methods in a table, but after some thinking I conclude that an IPaymentMethod interface with derived classes (eg. class CreditCard : IPaymentMethod), would be easier to extend and maintain.

Database Schema

1. Partial PaymentMethods Table

• Method ID (primary key)
• Name (eg. CreditCard, Check, WireTransfer)

2. Partial Orders Table

• Order ID (primary key)
• User ID (relates to Users table)
• Status (Pending or Completed)
• Total

3. Partial Payments Table

• Payment ID (primary key)
• Order ID (related to Orders table)
• Method ID (relates to PaymentMethods table)
• Date (for record-keeping)
• Amount

Order Saldo Query

To determine the total value of payments received for any given Order, simply sum the Amount the Payments table, grouped by Order ID:

SELECT
    OrderID,
    SUM(Amount) as Saldo
FROM Payments
GROUP BY
    Payments.OrderID