where is the scope?

Explain the mechanics of double constraints. Tell me, what are they?

Draw an ER diagram using Cardinality Notation for the following description: A veterinary hospital only treats dogs and cats (use ISA). Clients have an address, phone number and client ID. Each pet has a name, a pet ID and belongs to exactly one client. Each client can have at most 5 cats and 2 dogs.

The scenario is for a small life insurance agency and their need to keep track of clients, agents, insurers, and quotations. 1) A Client is a customer, potential customer, or contact of the agency. We need to assign each client a number and save their last name, first name, birth date, gender, telephone number, email address, and the agent who brought the client into the agency. If a client is a “walk in” they are assigned to the first available agent. All clients must have one primary agent. 2) An agent is a licensed individual with the state. Each agent has a nationally unique license number, last name, first name, telephone number, and email address. An agent must be the primary agent for at least one client but may not be primary for more than 500 clients. An agent must also be part of at least one quotation and may share in an unlimited number of quotes. 3) The agency represents (does business with) many insurance companies (insurers). We will need to track each insurer with an…