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Oracle Database 23ai SQL Associate Sample Questions:

1. Which of the following SET operators combines results from two queries and removes duplicates?

A) UNION
B) MINUS
C) UNION ALL
D) INTERSECT

2. What happens when the maximum value of a sequence is reached?

A) The sequence stops generating values.
B) An error is raised, and the sequence must be recreated.
C) The sequence resets to the starting value if the CYCLE option is specified.
D) The sequence starts decrementing values.

3. How are NULL values treated in relational databases?

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

4. Which of the following data dictionary views provides information about constraints on tables?

A) ALL_CONSTRAINTS
B) DBA_CONSTRAINTS
C) USER_CONSTRAINTS
D) All of the above

5. What does the following SQL query return?
SELECT employee_id, salary * 12 AS annual_salary FROM employees;

A) Employee IDs and their annual salaries
B) Monthly salaries of all employees
C) Only employees with salaries greater than 12
D) Salaries multiplied by 12 and stored in a new table

Solutions: