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CBIS 3210 FINAL EXAM QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS 2024
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CBIS 3210 FINAL EXAM QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS 2024
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CBIS 3210 FINAL EXAM QUESTIONS ANDANSWERS WITH VERIFIED SOLUTIONS 2024
The Entities of the ERD Equals - ANSWER Data Stores of DFD
Logical Database Modeling - ANSWER Deals with gathering business requirements and converting those
requirements into a model
Logical Database Modeling Systems Requirements - ANSWER Process Modeling: DFD
Conceptual Data Modeling: ERD
Logical Modeling Should Accurately Render - ANSWER A visual representation of the activities and data
relevant to a particular business
Physical Database Modeling - ANSWER Deals with the conversion of the logical, or business model, into a
relational database model
Relational Database - ANSWER Data represented as a set of related tables or relations
Normalization - ANSWER The process of converting complex data structures into simple, stable data
structures
Three Reasons for Normalization - ANSWER To minimize duplicate data
To minimize or avoid data modification issues
To simplify queries
Normalization Example - ANSWER What are the purposes of this table?
Minimize Data Duplication and Minimize or Avoid Data Modification Issues - ANSWER Do you see any
data duplication?
, Problems with Data Duplications - ANSWER It increases storage and decrease performance
It becomes more difficult to maintain data changes
Modification Anomalies - ANSWER Insert Anomaly
Update Anomaly
Deletion Anomaly
Search and Sort Issues - 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 - ANSWER Minimize data duplication
Minimize or avoid data modification issues
Simplify queries
Solution - Normalization - 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 - ANSWER There are three common forms of normalization: 1st, 2nd,
and 3rd Normal Form
First Normal Form - 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 - ANSWER The table is in first normal form and all the columns depend on the
table's primary key
Third Normal Form - ANSWER The table is in second normal form and all of its columns are not
transitively dependent on the primary key
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