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Oracle Database 23ai SQL Associate Sample Questions:
1. What does the following SQL statement do?
ALTER TABLE employees DROP COLUMN salary;
A) Drops the salary column from the employees table
B) Removes duplicate rows from the employees table
C) Sets the salary column to NULL for all rows
D) Deletes the employees table
2. Which clause is used to ensure that only specific rows are deleted in a DELETE statement?
A) FROM
B) SET
C) HAVING
D) WHERE
3. Which command creates a new role in Oracle Database?
A) ADD ROLE role_name;
B) CREATE NEW ROLE role_name;
C) CREATE ROLE role_name;
4. What does the INTERSECT operator do in SQL?
A) Returns rows from the first query that are not present in the second query
B) Combines rows from two queries and includes all duplicates
C) Combines all rows from two queries without any conditions
D) Returns rows that are present in both queries
5. What does the UNION ALL operation do when selecting matching columns from different tables?
SELECT employee_id, salary FROM employees
UNION ALL
SELECT employee_id, bonus FROM bonuses;
A) Returns only employees with duplicate employee IDs in both tables
B) Combines all employee IDs, salaries, and bonuses, including duplicates
C) Combines the salaries and bonuses for employees, removing duplicates
D) Returns only the employees with salaries and bonuses
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: D | Question # 3 Answer: C | Question # 4 Answer: D | Question # 5 Answer: B |
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