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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 ensure that a column only contains NULL values.
C) They enforce the uniqueness of values in a column.

2. What is the result of the following SQL query?
SELECT COALESCE(NULL, 100, 200) AS result FROM dual;

A) 300
B) 100
C) 200
D) NULL

3. Which function returns the current system date and time in the database session's time zone?

A) CURRENT_TIMESTAMP
B) SYSTEM_TIME
C) LOCAL_TIME
D) SYSDATE

4. What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);

A) Return all employees and their salaries
B) Return employees with a salary below the average salary
C) Return employees with a salary equal to the average salary
D) Return employees with a salary above the average salary

5. Which data dictionary view provides information about all tables accessible to the current user?

A) USER_TABLES
B) DBA_TABLES
C) SESSION_TABLES
D) ALL_TABLES

Solutions: