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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. What does the following SQL statement do?
CREATE TABLE employees (
employee_id NUMBER PRIMARY KEY,
first_name VARCHAR2(50),
hire_date DATE NOT NULL
);

A) Creates a table with a primary key and a NOT NULL constraint
B) Creates a temporary table
C) Creates a table with no constraints
D) Creates a table with only VARCHAR2 and DATE columns

3. What does the INTERSECT operator do in SQL?

A) Combines all rows from two queries without any conditions
B) Returns rows that are present in both queries
C) Returns rows from the first query that are not present in the second query
D) Combines rows from two queries and includes all duplicates

4. Which of the following can be achieved using a correlated subquery?

A) Comparing each employee's salary to the average salary of their department
B) Inserting data into a table
C) Retrieving duplicate records from a single table
D) Joining two tables without a common column

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

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

Solutions: