An example of an ER diagram for a bank database is provided below. You can see various entities such as a user, an account, a transaction, a payment, and a staff. The entities' attributes are also mentioned, and clear relationships have been drawn. This allows you to identify errors and flaws in the design before its practical application. This ER diagram for a bank database also demonstrates how a customer's information, such as his credit card, account, and loans, is linked to the bank's operations. Take note of the entities and attributes for a better understanding. Because ER diagrams are typically used to solve a specific problem, they always have a problem to solve.