Data Models into Database Designs Questions and Answers
Understanding how data models transform into database designs is a fundamental concept for database engineers and students preparing for aptitude questions and answers with explanations in exams and interviews. This topic explains how conceptual, logical, and physical data models convert theoretical structures into practical, relational database schemas. Knowing this process helps in optimizing performance, maintaining data integrity, and ensuring efficient query execution. Many questions related to data modeling appear in placement exams like TCS NQT, Wipro Elite, and Infosys InfyTQ. Through this topic, you’ll strengthen your foundation in entity-relationship diagrams (ERD), normalization, and schema mapping—skills that are essential for both DBMS aptitude test practice online and real-world database design challenges.
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Data Models into Database Designs
11. The identifier of an entity will become the ________ of the new table.
- foreign key
- main attribute
- primary key
- identity key
12. Which of the following data constraints would be used to specify that the value of a cell in one column must be less than the value of a cell in another column in the same row of the same table?
- A domain constraint
- A range constraint
- An intrarelation constraint
- An interrelation constraint
13. A unique, DBMS-supplied identifier used as the primary key of a relation is called a(n):
- primary key.
- foreign key.
- composite key.
- surrogate key.
14. Which is not true about surrogate keys?
- They are short.
- They are fixed.
- They have meaning to the user.
- They are numeric.
15. For every relationship, how many possible types of actions are there when enforcing minimum cardinalities?
- Two
- Three
- Four
- Six
16. Which constraint requires that the binary relationship indicate all combinations that must appear in the ternary relationship?
- MUST COVER
- MUST NOT
- Both of the above.
- None of the above is correct.
18. For every relationship, how many possible sets of minimum cardinalities are there?
- Two
- Three
- Four
- Six
19. If a relationship has a cascade updates constraint, then if ________ in the parent table is changed, then the same change will automatically be made to any corresponding foreign key value.
- the primary key
- any alternate key
- a surrogate key
- a foreign key
20. Which of the following column properties would be used to specify that cells in a column must contain a monetary value that is less than another monetary value in the same row?
- Null status
- Data type
- Default value
- Data constraints