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Oracle Database 23ai SQL Associate Sample Questions:

1. What is the result of the following query?
SELECT employee_id
FROM employees
WHERE EXISTS (SELECT 1 FROM departments WHERE department_id = 10);

A) Employee IDs from departments with no employees
B) Employees with salaries greater than 10
C) Employee IDs from department 10
D) All employee IDs

2. Which SQL function converts a string representation of a date into a date data type?

A) CAST_TO_DATE
B) CONVERT_TO_DATE
C) DATE_CONVERT
D) TO_DATE

3. Which type of join retrieves only the rows with matching values in both tables?

A) OUTER JOIN
B) INNER JOIN
C) CROSS JOIN
D) NATURAL JOIN

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

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

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

Solutions: