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Oracle 1Z1-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

1. Which SQL keyword is used to remove duplicate rows from the result set of a query?

A) ONLY
B) UNIQUE
C) DISTINCT
D) DISTINCTROW

2. What is the difference between UNION and UNION ALL?

A) UNION removes duplicates, while UNION ALL includes all rows, including duplicates.
B) UNION includes all rows, while UNION ALL removes duplicates.
C) UNION combines columns, while UNION ALL combines rows.
D) UNION works with subqueries, while UNION ALL does not.

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

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

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

5. What does the following query return?
SELECT department_id FROM departments
INTERSECT
SELECT department_id FROM employees;

A) Department IDs that exist in both the departments and employees tables
B) All department IDs from the departments table
C) All department IDs from the employees table
D) Department IDs that exist only in the employees table

Solutions: