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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the EXISTS operator check in a subquery?

A) If the subquery references the outer query
B) If the subquery returns a specific number of rows
C) If the subquery contains only unique values
D) If the subquery returns any rows

2. Which type of privilege allows a user to perform administrative tasks, such as creating other users?

A) Object privilege
B) Table privilege
C) System privilege
D) Schema privilege

3. What does the following SQL statement do?
SELECT e.employee_id, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id;

A) Retrieves employees and departments with matching department_id
B) Retrieves all employees and their departments
C) Retrieves only departments with no employees
D) Retrieves only employees without departments

4. What is the purpose of the MERGE statement in SQL?

A) To combine the results of two queries
B) To join two tables into one
C) To delete duplicate rows from a table
D) To update existing rows or insert new rows in a target table

5. Which command is used to add a new column to an existing table?

A) ALTER TABLE
B) ALTER COLUMN
C) ADD COLUMN
D) MODIFY COLUMN

Solutions: