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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. What will the following query return?
SELECT EXTRACT(YEAR FROM CURRENT_DATE) AS year FROM dual;

A) The full date in the session time zone
B) An error due to incorrect syntax
C) The current year in the database time zone

3. Which INTERVAL data type would you use to store a period of time in years and months?

A) INTERVAL DAY TO SECOND
B) INTERVAL YEAR TO MONTH
C) INTERVAL MONTH TO DAY
D) INTERVAL MINUTE TO HOUR

4. What will the following SQL query do?
UPDATE employees
SET salary = salary * 1.1
WHERE department_id = 10;

A) Set the salary to 1.1 for employees in department 10
B) Increase the salary of all employees by 10%
C) Increase the salary of employees in department 10 by 10%
D) Decrease the salary of employees in department 10 by 10%

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

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

Solutions: