BSAD 141, Fall 2017 In-class ERD exercise (Tuesday, 10/24)

Transcription

1 BSAD 4, Fall 207 In-class ERD exercise (Tuesday, 0/24) Student / Course Section example: This example builds directly on the : example we discussed in class last week and is the last in-class example that involves normalizing data. You are given a bunch of data that are loosely organized into Excel tables. The data are not normalized. They are kind of a mess and you should notice that there are quite a few redundancies in the data. If we were to scale the example up by adding more data, it would quickly become very difficult to manage and use the data in their current form.. Normalize the data by Identify the specific entities (people, places, things, events) about which data are collected. These entities will become the entity sets or tables in your ERD and subsequently in the Access RDBS. You want to separate the attributes and data associated with each entity and put those data in the appropriate tables. For example: you have information specifically related to students. 2. By looking at the data and thinking about the relationships between the different entities, you should be able to come up with logical or sensible relationships between the tables in your ERD. For example: how would you relate the entity course to entity course section? A specific course can have many course sections, but each course section belongs to only one course. i.e. the course BSAD 4 can have many course sections associated with it (BSAD 4 A, BSAD 4 B, BSAD 4 C, etc ), but each course section (A, B, C, etc ) belongs to the one course BSAD 4. Each course section has its own CRN, has a unique meeting time, is taught by a particular professor, etc. Course Can have Each belongs to Course Section 3. DRAW (with pen or pencil) the ERD describing the relationships between all of the entities. Using the data I provided you, list the attributes associated with each table. USE PROPER NOTATION!!! a) ID the PK for each entity (if there is not a PK that should be used, you could create one) b) List the attributes (fields) for each entity under/by each table c) ID and resolve any : relationships d) ID ALL FKs

2 4. Once you have completed the written ERD, implement the ERD in S Access. Pay attention to how you format the attribute field. For example, you should format numeric data as numbers, dates as time/data, etc. ake sure you can correctly link all tables using relationships menu item and make sure you check enforce referential integrity. Some pointers for Access (we have discussed these in class):. Build your tables and relationships st don t start putting data in the tables before all tables a built and the relationships are set 2. ake sure all tables have an appropriate PK field. It could be a composite key in some cases. 3. Place all FK attributes in appropriate tables 4. Create the relationships in Access 5. ONLY ENTER DATA AFTER YOU ARE SURE THE TABLE STRUCTURE AND KEYS ARE CORRECT AND ATCH YOUR ERD 6. Enter data on the ONE SIDE of the relationship first

3 Stu_# Stu_L_Name Stu_F_Name Stu_Add Crse_Title Section CRN Crse_Start Crse_End Prof_L_Name eet_day Building Room_# Grade 4455 Wier Bob 23 Green St. BSAD 4 A 333 0:00 A :5 A Novak T, TH Kalkin 004 A Smith Sally 62 Yellow St. BSAD 4 A 333 0:00 A :5 A Novak T, TH Kalkin 004 C 2222 Simpson Lisa 80 Red Road BSAD 4 A 333 0:00 A :5 A Novak T, TH Kalkin 004 A Burns onty 5 Reactor Rd. BSAD 4 A 333 0:00 A :5 A Novak T, TH Kalkin 004 B 4455 Wier Bob 23 Green St. BSAD 80 A 23 :30 A 2:45 P Thomas T, TH Kalkin 003 B 6688 Smith Sally 62 Yellow St. BSAD 80 A 23 :30 A 2:45 P Thomas T, TH Kalkin 003 B 2222 Simpson Lisa 80 Red Road BSAD 80 A 23 :30 A 2:45 P Thomas T, TH Kalkin 003 A Burns onty 5 Reactor Rd. BSAD 80 A 23 :30 A 2:45 P Thomas T, TH Kalkin 003 C 4455 Wier Bob 23 Green St. BSAD 73 B 222 9:00 A 0:5 A Lucas, W Kalkin 004 B Smith Sally 62 Yellow St. BSAD 73 B 222 9:00 A 0:5 A Lucas, W Kalkin 004 B Simpson Lisa 80 Red Road BSAD 73 B 222 9:00 A 0:5 A Lucas, W Kalkin 004 A Burns onty 5 Reactor Rd. BSAD 73 B 222 9:00 A 0:5 A Lucas, W Kalkin 004 C+ Building Room_# Seat_Cap Audio/Visual Kalkin yes Kalkin yes Votey no Kalkin yes Prof_ID Prof_L_Name Prof_F_Name Office_# Phone_# Crse_Title Section CRN Crse_Start Crse_End eet_day P Novak David BSAD 4 A 333 0:00 A :5 A T, TH P Novak David BSAD 4 B 334 :30 A 2:45 P T, TH P20 Thomas ike 33 A BSAD 80 A 23 :30 A 2:45 P T, TH P20 Thomas ike 33 A BSAD 280 A 555 5:00 P 6:5 P T, TH P Do Hung BSAD 73 A 220 :00 P 3:30 P F P8 Lucas arilyn BSAD 73 B 222 9:00 A 0:5 A, W

4 Crse_Title Section CRN Crse_Start Crse_End eet_day Building Room_# BSAD 4 A 333 0:00 A :5 A T, TH Kalkin 004 BSAD 4 B 444 :30 A 2:45 P T, TH Kalkin 004 BSAD 80 A 23 :30 A 2:45 P T, TH Kalkin 003 BSAD 280 A 555 5:00 P 8:5 T, TH Kalkin 00 BSAD 73 B 222 9:00 A 0:5 A, W Kalkin 004 Crse_Name Crse_Title Crse_description Credits Introduces business information systems and how they enable better managerial decision-making. Discusses problems in analyzing, designing, and implementing such systems. 3 Introduction to anagement Information Systems BSAD 4 anagerial Finance BSAD 80 Production and Operations Analysis BSAD 73 Principles of anagement and Org Behavior BSAD 20 Financial Accounting BSAD 60 The financial function in the corporation. Techniques for evaluating current use of resources and proposed resource acquisitions or dispositions. 3 Introduces decisions related to the design, management, and improvement of activities that create and deliver a firm's products and services. 3 How people in organizations think and behave. Focuses on how leadership and motivation affect individuals and teams in the workplace and a global business context. 3 Introduction to the accounting system and generally accepted accounting principles that govern income determination and financial position presentation. 3

5 Course Has Professor Teaches Is taught by Part of Section Taught in Can be Listed on Lists Schedule Line Item Lists Can be Listed on Student Can hold Room Professor table Prof_ID (PK) Prof_L_Name Prof_F_Name Prof_Phone Office# Course table Crse_Title (PK) Crse_Name Crse_Desc Credits Student table Stu_I# (PK) Stu_L_Name Stu_F_Name Stu_Address Room table Room# (PK) Building (PK) Seat_Capacity Audio/Visual Composite PK Section table CRN (PK) Section_Letter Crse_Start_Time Crse_End_Time Crse_eet_Day Crse_Title (FK to Course Table) Prof_ID (FK to Professor table) Room# Building Composite PK Composite FK to room table Schedule Line Item table CRN (PK) (Also FK to Section table) Stu_# (PK) (Also FK to Student table) Grade

6 Student Table Design View Course Table Design View

7 Professor Table Design View Room Table (Note that this table has a composite PK) Design View

8 Section Table (Note that this table has 3 foreign keys Prof_ID to Professor, Course_Title to Course, and the composite of Room# and Building to Room) Design View Schedule Line Item table (Note that this table has a composite PK and 2 foreign keys CRN to section, and Stu_# to student) Design View

9 The relationships in Access look like: Now, once you have created all the tables using the appropriate attributes, have identified your primary keys in each table, and have included all foreign keys in the appropriate tables, you can enter data.

10 ALWAYS enter data on the parent side of the relationship FIRST. So, start with the tables that are on the (one) side of the relationship: Professor, Course, Room, and Student. This prevents referential integrity violations. Next, enter data in the Section table (because CRN is a foreign key in Schedule Line Item). And, lastly enter data in the Schedule Line Item table.