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
1. Which of the following data constraints would be used to specify that the value of cells in a column must be one of a specific set of possible values?
- A domain constraint
- A range constraint
- An intrarelation constraint
- An interrelation constraint
2. In a 1:N relationship, the foreign key is placed in:
- either table without specifying parent and child tables.
- the parent table.
- the child table.
- either the parent table or the child table.
3. Which of the following column properties specifies whether or not cells in a column must contain a data value?
- Null status
- Data type
- Default value
- Data constraints
4. A primary key should be defined as:
- NULL.
- NOT NULL.
- Either of the above can be used.
- None of the above are correct.
5. Which of the following column properties would be used to specify that cells in a column must contain a monetary value?
- Null status
- Data type
- Default value
- Data constraints
6. Which of the following situation requires the use of ID-dependent entities?
- Association relationships only
- Multivalued attributes only
- Archetype/instance relationships only
- All of the above use ID dependent entities
7. A foreign key is:
- a column containing the primary key of another table.
- used to define data types.
- used to define null status.
- all of the above are above correct.
8. Which of the following columns is(are) are required in a table?
- A foreign key
- An alternate key
- A primary key
- A surrogate key.
9. In a 1:1 relationship, the foreign key is placed in:
- either table without specifying parent and child tables.
- the parent table.
- the child table.
- either the parent table or the child table.
10. Which of the following column properties would be used to specify that cells in a column must be immediately filled with a monetary value of $10,000?
- Null status
- Data type
- Default value
- Data constraints