ACIS Introduction to Data Analytics & Business Intelligence Database Design ERD

Business Intelligence Data Analytics E-commerce Big Data* Methods Data Mining* Text Mining* OLAP* Visualization* Query  Data Analytics E-commerce Big Data* Methods Data Mining* Text Mining* OLAP* Visualization* Query  Database Benefits  Components  Database Benefits  Components  Implement with: * Excel  Access PowerPoint

Concept Map Relationships Database Design Entities Cardinality

Objectives Discuss the purpose of using an ERD. Demonstrate the ability to read the details of an ERD.

Segment A: ERD

Source Document

Source Data

E-R Model or ERD Logical representation of database

Relationships

How Do I Read a Relationship? A Customer may have a minimum of zero and a maximum of many Orders. An Order may belong to a minimum of one and a maximum of one Customer.

ERD According to the ERD below, how many observations can a participant have at most? A.Zero B.One C.Many

ERD According to the ERD below, what is the minimum number of participants a given observation can be associated with? A.Zero B.One C.Many

ERD According to the ERD below, when is a person stored as a participant? A.Before their first observation is recorded B.At the same time their first observation is recorded C.At the same time their last observation is recorded D.After their last observation is recorded

Segment B: ERD Activity

You are a very busy plumber. You do only subcontract work which means you don’t work for individual homeowners, you work for contractors. You are so successful now that you’d like to be selective about the contractors you work for. You’d like to develop a database to help you analyze which contractors give you the best work. You prefer commercial jobs to residential, and jobs that are clearly specified with few changes after the project begins. You prefer local jobs. You’ll need to keep track of basic contact information about each contractor as well as qualitative aspects of each job.

Generalized ERD A X - PK Y B Z - PK X