CBIS 3210 Final Exam Questions With Complete Solutions
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Course
CBIS 3210
Institution
CBIS 3210
The Entities of the ERD Equals correct answer: Data Stores of DFD
Logical Database Modeling correct answer: Deals with gathering business requirements and converting those requirements into a model
Logical Database Modeling Systems Requirements correct answer: Process Modeling: DFD
Concep...
CBIS 3210 Final Exam Questions With
Complete Solutions
The Entities of the ERD Equals correct answer: Data Stores of DFD
Logical Database Modeling correct answer: Deals with gathering business requirements and converting those requirements into a model
Logical Database Modeling Systems Requirements correct answer: Process Modeling: DFD
Conceptual Data Modeling: ERD
Logical Modeling Should Accurately Render correct answer: A visual representation of the activities and data relevant to a particular business
Physical Database Modeling correct answer: Deals with the conversion of the logical, or business model, into a relational database model
Relational Database correct answer: Data represented as a set of
related tables or relations
Normalization correct answer: The process of converting complex data structures into simple, stable data structures Three Reasons for Normalization correct answer: To minimize duplicate data
To minimize or avoid data modification issues
To simplify queries
Normalization Example correct answer: What are the purposes of this table?
Minimize Data Duplication and Minimize or Avoid Data Modification Issues correct answer: Do you see any data duplication?
Problems with Data Duplications correct answer: It increases storage and decrease performance
It becomes more difficult to maintain data changes
Modification Anomalies correct answer: Insert Anomaly
Update Anomaly
Deletion Anomaly
Search and Sort Issues correct answer: In the SalesStaff table if you want to search the sales office which is in charge of a specific customer such as Ford, you would have to write a query
like the one on the next slide.
Seems to be an easy question but the query is surprisingly complex
Normalization Equals Rules to correct answer: Minimize data duplication
Minimize or avoid data modification issues
Simplify queries Solution - Normalization correct answer: Normalization simplifies databases by properly separating the data into different tables, to house the data in tables which serve a single purpose
Common Forms of Normalization correct answer: There are three common forms of normalization: 1st, 2nd, and 3rd Normal Form
First Normal Form correct answer: The information is stored in a relational table and each column contains atomic values, and there are not repeating groups of columns
Second Normal Form correct answer: The table is in first normal form and all the columns depend on the table's primary key
Third Normal Form correct answer: The table is in second normal form and all of its columns are not transitively dependent
on the primary key
Normal Form Abbreviations correct answer: First Normal Form
- 1NF
Second Normal Form - 2NF
Third Normal Form - 3NF
First Normal Form Rules correct answer: The data is in a database table. The table stores information in rows and columns
where one or more columns, called the primary key, uniquely identify each row.
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