Getting Started with InfoSphere Data Architect
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Chapter 3 – Logical <strong>Data</strong> Modeling 75<br />
A. Constraint<br />
B. Primary key<br />
C. Glossary model<br />
D. Relationship<br />
2. Which of the following is not a definition of an entity?<br />
A. An entity is a collection of real-world objects or concepts that have many<br />
common properties.<br />
B. An entity is an instance of real-world objects.<br />
C. An entity is a set of entities of the same type that share the same properties.<br />
D. An entity is an item that exists and is distinguishable from other items.<br />
3. Which of the following data types is a better option for a person’s phone number<br />
attribute?<br />
A. NUMERIC<br />
B. INTEGER<br />
C. CHAR<br />
D. LONG<br />
4. Draw entities and relationship sets for each of the following.<br />
A. Each garage may house one or more cars. Each car may stay in one and only<br />
one garage.<br />
B. Each student may learn from one or more teachers. Each teacher may<br />
educate one or more students.<br />
C. An employee may manage one or more employees. An employee must be<br />
managed by one employee.<br />
D. An employee may belong to one company’s branch. A company’s branch must<br />
have one or more employees.<br />
5. Resolve the many-to-many relationship set between students and teachers. Think<br />
of additional attributes for the new entity.<br />
6. Given the following entities <strong>with</strong>in a logical data model, a graphical representation<br />
of the relationship and entity sets has to be provided:<br />
• a company’s branch;<br />
• employees and their relatives of the company’s branch;<br />
Draft a data model diagram.
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