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Oracle Database 23ai SQL Associate Sample Questions:

1. What is a subquery in SQL?

A) A query used to create a table
B) A query that combines data from multiple tables
C) A query inside another query
D) A query used for joining two or more tables

2. What happens if a DELETE statement is executed without a WHERE clause?

A) All rows in the table are deleted.
B) No rows are deleted.
C) Only the first row is deleted.
D) An error is raised.

3. 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) Returns only the employees with salaries and bonuses
C) Combines all employee IDs, salaries, and bonuses, including duplicates
D) Combines the salaries and bonuses for employees, removing duplicates

4. Which SQL clause is used to specify the source table in a query?

A) FROM
B) SELECT
C) WHERE
D) GROUP BY

5. Which SQL statement is used to insert a new row into a table?

A) UPDATE
B) SELECT
C) INSERT
D) ALTER

Solutions: