Oracle 1Z0-171 Exam Questions : Oracle Database 23ai SQL Associate

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Oracle 1Z0-171 Exam Syllabus Topics:

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) OUTER JOIN
C) NATURAL JOIN
D) CROSS JOIN

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

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

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

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

4. Which command is used to add a new column to an existing table?

A) ALTER TABLE
B) MODIFY COLUMN
C) ALTER COLUMN
D) ADD COLUMN

5. What will the following query do?
DELETE FROM employees
WHERE department_id = 20;

A) Delete all rows in the employees table
B) Delete all rows where department_id is 20
C) Delete the department_id column in the employees table
D) Raise an error because DELETE cannot use a WHERE clause

Solutions: