Question

Assignment 4 provides practice with applying the ERD notation to narrative problem descriptions. This assignment involves problems 20, 33, 34, 35, and 36 on Page 224 in the textbook (Chapter 6). Plan to use the drawing tool of your choice to create the ERD then copy and paste each ERD into a Word document. Label the problems in your Word document to match the problem in the textbook.

Problems 33 to 36 are worth 15% each. Problem 20 is worth 40%. As for other course assignments, you will receive partial credit depending on the severity of errors in each problem.

33. Draw an ERD to track lab tests performed by a medical laboratory on clients. The database should track basic client details including a unique client identifier, client name, client insurance provider (if any), client address, client date of birth, and client sex. The database should track the unique identifier for a lab test, the test type identifier, the date and time when the lab test was administered, and the identifier of the lab employee performing the test. A client can request multiple tests in a visit to the lab. The database only contains clients who have had lab tests performed. Each lab test is administered to one client. (15%)

34. Revise the ERD from problem 33 with more details about test types. A test type includes a unique test type identifier, a test type name, a test type cost, and a test type code. A lab test administered to a client is associated with one test type. A test type can be administered to multiple clients. A test type can exist in the database without ever being administered. (15%)

35. Revise the ERD from problem 34 with test type items. A test type item includes a unique test item identifier, a test item name, test item unit of measure, and a test item description. A test type includes one or more test items. A test item can be part of one or more test types. (15%)

36. Revise the ERD from problem 35 to include lab test results. Each administered lab test has a result for each item on the test type. A test item result includes a unique test item results identifier, the analysis date, the employee identifier of the lab technician measuring the result, the measured value of the test type item, and an optional description of the test item’s appearance. An administered lab test has one or more associated test item results although there are no associated results until lab analysis is complete. A test item can have many associated test item results. Test items never administered will not have any associated test item results. (15%)

1/30/2020                               Assignment 4 Details                                                    Page 2

20. For the following problem, define an ERD for the initial requirements and then revise the ERD for the new requirements. Your solution should have an initial ERD, a revised ERD, and a list of design decisions for each ERD. In performing your analysis, you may want to follow the approach presented in Section 6.1. (40%)

Design a database for managing the task assignments on a work order. A work order records the set of tasks requested by a customer at a specified location.

• A customer has a unique customer identifier, a name, a billing address (street, city, state, and zip), and a collection of submitted work orders.
• A work order has a unique work order number, a creation date, a date required, a completion date, a customer, an optional supervising employee, a work address (street, city, state, zip), and a set of tasks.
• Each task has a unique task identifier, a task name, an hourly rate, and estimated hours. Tasks are standardized across work orders so that the same task can be performed on many work orders.
• Each task on a work order has a status (not started, in progress, or completed), actual hours, and a completion date. The completion date is not entered until the status changes to complete.

After reviewing your initial design, the company decides to revise the requirements. Make a separate ERD to show your refinements. Refine your original ERD to support the following new requirements:

• The company wants to maintain a list of materials. The data about materials include a unique material identifier, a name, and an estimated cost. A material can appear on multiple work orders.
• Each work order uses a collection of materials. A material used on a work order includes the estimated quantity of the material and the actual quantity of the material used.
• The estimated number of hours for a task depends on the work order and task, not on the task alone. Each task of a work order includes an estimated number of hours.

Answer 1

Answer: E R Diagram for lab test system is shown below with expansions as per 33,34,35 constraints of the given problem.

Answer (b): ERD for Managing task assignment Work order Management :