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Oracle Database 23ai SQL Associate Sample Questions:

1. What does a Cartesian product in SQL result from?

A) A NATURAL JOIN without specifying join conditions
B) An INNER JOIN without specifying join conditions
C) An OUTER JOIN with NULL values

2. What does the following SQL query do?
SELECT *
FROM employees e
JOIN employees m ON e.manager_id = m.employee_id;

A) Lists employees who are not managers
B) Lists employees without departments
C) Lists employees who are managers
D) Lists employees and their corresponding managers

3. Which SQL function can be used to replace NULL values with a specified value?

A) COALESCE
B) NVL
C) REPLACE
D) ISNULL

4. 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 table with a primary key and a NOT NULL constraint
C) Creates a table with no constraints
D) Creates a temporary table

5. Which INTERVAL data type would you use to store a period of time in years and months?

A) INTERVAL YEAR TO MONTH
B) INTERVAL DAY TO SECOND
C) INTERVAL MONTH TO DAY
D) INTERVAL MINUTE TO HOUR

Solutions: