5.9: Summary
- Page ID
- 95169
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Key Takeaways
- Data is made up of facts of the world. You must process data to get information.
- A database is an organized collection of related data.
- A database management system (DBMS) is a software application that is used to create and manage databases, and can take the form of a personal DBMS, used by one person, or an enterprise DBMS that can be used by multiple users
- Relational databases are the most widely used type of database, where data is structured into tables and all tables must be related to each other through unique identifiers.
- Designing a relational database involves determining how the data is organized into tables, setting primary keys and creating relationships among the tables.
- Normalization is the process of designing a database to reduce redundancy and ensure integrity.
- The database approach allows for the control of redundant data, data integrity, data sharing, and security and recovery.
- There are many data types, and it is important to use the correct one.
Exercises
- What is metadata?
- Explain in your own words how the data component relates to the hardware and software components of information systems.
- What is a database management system and how does it work?
- What is the difference between a spreadsheet and a database? List three differences between them.
- What are the characteristics of a relational database?
- Outline the steps of the data hierarchy using an example.
- How do you go about choosing a primary key? What are some of the characteristics you would look for?
- Describe what the term normalization means.
- What are the benefits of using the database approach?
- What language can be used to create queries in databases?
- Why is it important to define the data type of a field when designing a relational database?
- Name a database you interact with frequently. What would some of the field names be?
Assignment
Overview
This assignment is designed to help you understand how to model a relational database.
Assignment
- Using the data in the Cake Order Database, decide what tables of data could be created, and what fields would be included in the tables.
- Identify what field would serve as the primary key for the tables.
- Create an entity relationship diagram showing the tables (with fields) and relationships among the tables.
- What other data could be included in this database? What benefits are there from organizing the data this way as opposed to in an Excel file?
Chapter 5 Attributions
Business Computer Information Systems:6.1 Data, Information and Knowledge by Emese Felvegi; Barbara Lave; Diane Shingledecker; Julie Romey; Noreen Brown; Mary Schatz; OpenStax; Saylor Academy; University of Minnesota Libraries; and Robert McCarn is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.
Database Design – 2nd Edition Chapter 7 the Relational Data Model & Chapter 5 Data Modeling by Adrienne Watt is licensed under a Creative Commons Attribution 4.0 International License except where otherwise noted.
Information Systems for Business and Beyond (2019)- Chapter 4 by David Bourgeois is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted