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Oracle Database 23ai SQL Associate Sample Questions:

1. 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 uses a tabular structure with rows and columns to represent relationships between data entities
C) A database that organizes data hierarchically
D) A flat file system with no defined relationships between data

2. Which Oracle SQL function returns the current date and time, including time zone information?

A) CURRENT_TIMESTAMP
B) SYSDATE
C) NOW
D) CURRENT_DATE

3. What does the following SQL query do?
SELECT *
FROM employees e
JOIN employees m ON e.manager_id = m.employee_id;

A) Lists employees without departments
B) Lists employees and their corresponding managers
C) Lists employees who are managers
D) Lists employees who are not managers

4. What is the primary purpose of an index in SQL?

A) To enforce data integrity constraints
B) To store metadata about a table
C) To improve the performance of data retrieval queries
D) To ensure uniqueness of values in a column

5. Which of the following is true about foreign key constraints in SQL?

A) They ensure that a column only contains NULL values.
B) They define a relationship between two tables.
C) They enforce the uniqueness of values in a column.

Solutions: