Draw an entity relationship diagram that describes the following business environment

draw an entity relationship diagram that describes the following business environment

The Problem Draw an entity-relationship diagram that describes the following business environment. The city of Chicago, IL, wants to maintain information about. Draw an entity-relationship diagram that describes the following business environment. The city of Chicago, IL, wants to maintain information about its extensive. Draw an entity-relationship diagram that describes the following business environment. Orlando Junior Baseball wants to maintain information about its teams.

Develop sample customer and order data and construct two relational tables in the style of Figure 3. Do any fields have to be added to one or the other of the two tables to record the relationship between customers and orders? Merge these two tables into one, as in the style of Figure 3.

draw an entity relationship diagram that describes the following business environment

Does this create any problems with the data? The Customer Number field has to be added to the Order file in order to store the one-to-many relationship between customers and orders.

Chapter 2, 3, 4, Sample Solutions - Marshall University Personal

Merging these two tables creates considerable data redundancy because all of the data for a particular customer has to be repeated as many times as the number of orders it has. Consider the following relational database for the Quality Appliance Manufacturing Co. The database is designed to track the major appliances refrigerators, washing machines, dishwashers, etc.

Note the following facts about this environment: Supplier number is a unique identifier. Parts are the major components that the suppliers supply to Quality. Each part comes with a part number but that part number is only unique within a supplier. Each appliance that Quality manufactures is given an appliance number that is unique across all of the types of appliances that Quality makes. Buyers are major department stores, home improvement chains, and wholesalers. Buyer numbers are unique.

Creating an ERD Part 1 Define the Problem

An appliance may be inspected by several inspectors. List the names, in alphabetic order, of the suppliers located in London, Liverpool, or Manchester, UK.

What was the highest inspection score achieved by a refrigerator on November 3, ? Find the total amount of money spent on Quality Appliance products by each buyer from Mexico, Venezuela, and Argentina.

Find the total cost of the parts used in each dishwasher manufactured on February 28, List the highest paid inspectors.

List the highest paid inspectors who were hired in Among all of the inspectors, list those who earn more money than the highest paid inspector who was hired in Notice the entities are singular not plural. The problem description indicates we need to track more than just degrees so we will change the Degree entity to University and include degree info there.

Teacher are employed at a school. Teacher teach subject to student. Teacher attended an university Administrator run the school. Teacher supervise other teachers. The next step is to identify the relationship between the entities.

draw an entity relationship diagram that describes the following business environment

The problem description should provide the appropriate information. In our problem, you can see these relationships. A student attends one school but a school can have many students.

The relationship type refers to the connectivity.

Chapter 2, 3, 4, Sample Solutions - Marshall University Personal

Is the connectivity 1: You may need to make some assumptions about the relationship as is done in the example above. Any previous schools attended do not need to be tracked. Always verify these assumptions with the appropriate employee when creating databases for a business. The many-to-many relationship is the result of the need to track previous schools at which the teacher taught. A teacher can teach multiple subjects to many students.

Steps to draw ER DIAGRAM in Database management system

A student can take many subjects from many teachers. A subject can be taken by many students and taught by many teachers. Many times a ternary relationship can and should be broken into two binary relationships. This cannot be done in this situation.