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Oracle Database 23ai SQL Associate Sample Questions:

1. In a relational database, what is a foreign key?

A) A unique identifier for a record in a table
B) A key used to sort data in a specific order
C) A key that is used to establish a relationship between two tables
D) A temporary key generated during query execution

2. What does the following query return?
SELECT department_id FROM departments
INTERSECT
SELECT department_id FROM employees;

A) Department IDs that exist only in the employees table
B) Department IDs that exist in both the departments and employees tables
C) All department IDs from the employees table
D) All department IDs from the departments table

3. What is the output of the following query?
SELECT CURRENT_DATE FROM dual;

A) The current date and time in the database time zone
B) The current date in the session time zone
C) The current date in the database time zone
D) The current date and time in UTC

4. Which of the following best describes a relational database?

A) A database where all data is stored as key-value pairs
B) A database that organizes data hierarchically
C) A database that uses a tabular structure with rows and columns to represent relationships between data entities
D) A flat file system with no defined relationships between data

5. How are NULL values treated in relational databases?

A) NULL values are treated as zero.
B) NULL values are treated as empty strings.
C) NULL values are not allowed in relational databases.
D) NULL values represent missing or unknown data.

Solutions: