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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. Which Oracle SQL function returns the current date and time, including time zone information?

A) CURRENT_TIMESTAMP
B) SYSDATE
C) CURRENT_DATE
D) NOW

3. Which type of subquery returns exactly one value?

A) Correlated subquery
B) Multiple-row subquery
C) Scalar subquery
D) Inline view

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. What does the EXISTS operator check in a subquery?

A) If the subquery returns a specific number of rows
B) If the subquery returns any rows
C) If the subquery references the outer query
D) If the subquery contains only unique values

Solutions: