1Z0-006 Relational Data Model Questions and Answers

Question 1

In the context of the relational data model, what is the primary purpose of normalization?

Accepted Answer

To reduce data redundancy and improve data integrity.

Answer

To increase query performance by adding redundant data.

Answer

To create a single, large table to simplify data access.

Answer

To enforce security by encrypting all data within the tables.

Question 2

A table named 'EMPLOYEES' has columns 'Employee_ID', 'SSN', and 'Email'. All three columns contain unique values for each employee. Which term best describes all three of these columns collectively before one is chosen to uniquely identify records?

Accepted Answer

Candidate Keys

Answer

Foreign Keys

Answer

Super Keys

Answer

Primary Keys

Question 3

Which of the following constraints is used to link a column in a 'child' table to a primary key in a 'parent' table, ensuring that a value can only be inserted in the child table if it already exists in the parent table?

Accepted Answer

FOREIGN KEY

Answer

CHECK

Answer

UNIQUE

Answer

NOT NULL

Question 4

A database designer is modeling a relationship between 'Students' and 'Courses'. A student can enroll in many courses, and a course can have many students. What is the term for this type of relationship cardinality?

Accepted Answer

Many-to-Many

Answer

One-to-One

Answer

One-to-Many

Answer

Recursive

Question 5

Which of the following is a fundamental characteristic of the relational model, stating that each cell at the intersection of a row and column must hold a single, indivisible value?

Accepted Answer

Atomicity

Answer

Entity Integrity

Answer

Referential Integrity

Answer

Durability

Question 6

In a relational database, what is the correct term for a single row in a table, which represents a single, implicitly structured data item in the table?

Accepted Answer

Tuple

Answer

Attribute

Answer

Relation

Answer

Schema