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Sample Databases
Part 1
Come up with an original example of a one to many unary relationship. Create an example model of this relationship using the MySQL Workbench data modeler.
Part 2
Come up with an original example of a ternary relationship. Create an example model of this relationship using the MySQL Workbench data modeler.
Part 3
Using MySQL Workbench - Create a data model for on Adult Baseball league which supports all of the following data requirements:
Teams
• A team has a unique number associated with it• Team Name• Team City• Each team has more than one player associated with it
Players
• Each Player has a unique number• A player may play or have played for more than one team• The number of years and batting average is tracked for each team the player played for.
Coaches
• In this league, all coaches are also players.• A Team can have more than one coach.
Bats
• A team can have multiple bats• Each bat is identified by a unique serial number.
For each of the three models above, you should export your model as a single page PDF and submit the resulting files.
Transform the following entities into 1NF and 2NF entities. Draw the original and final data models, and state any reasonable assumptions. (Note: primary keys are underlined)
Draw the General Hardware Company Entity-Relational diagram. Choose a primary key for each of the relations. Choose foreign key(s) for each of the relations.
Describe the biggest challenge to the successful use of use-case modeling and recommend how to overcome the challenge.
Name four attributes that you can use to define a data flow in the grocery inventory information system.
A primary key can be computer generated. consists of one field only that uniquely identifies each record in a table. is a relationship between two or more tables. All of the above.
Compare and contrast database connectivity in VB and C#. If you studied database connectivity in Java, include Java in the comparison. In which language do you find it easiest to implement a connection to a database? Why
How can you create and manipulate an object in SQL?
List the rows in each of the joined tables. Use the small database shown in Figure Q3.5 to illustrate the difference between a natural JOIN, an equiJOlN, and an outer JOIN.
Evaluate how the design of a database can affect data quality. Discuss the role of a data dictionary in ensuring both the quality of enterprise-wide data and data within a specific database application.
Under what situations would denormalization of a database schema be used? Give examples of denormalization.
Note: The counties for the state capitals shown in the figure above are Travis and Williamson counties for Austin TX; Hartford county for Hartford CT; Clinton, Eaton, and Ingham counties for Lansing, MI; Davidson county for Nashville TN; Hughes co..
You are to design a database for DGTHOT (Dax's Good Times House of Tutoring). The company offers its tutoring services to both individuals and companies.
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