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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. What type of join does the following query perform?
SELECT *
FROM employees e, departments d
WHERE e.department_id = d.department_id;

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

3. Which clause in a SQL SELECT statement is used to define the columns to be retrieved?

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

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

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) Combines the salaries and bonuses for employees, removing duplicates
B) Combines all employee IDs, salaries, and bonuses, including duplicates
C) Returns only the employees with salaries and bonuses
D) Returns only employees with duplicate employee IDs in both tables

Solutions: