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Question 1
In MySQL 8.0, which JOIN type returns the Cartesian product of two tables when no ON or USING clause is specified?
Correct Answer:
CROSS JOIN
Question 2
Which set operator was introduced in MySQL 8.0.31 to return rows that appear in both of two SELECT result sets?
Correct Answer:
INTERSECT
Question 3
Given the query below, what does the WITH clause define? WITH RECURSIVE cte AS ( SELECT 1 AS n UNION ALL SELECT n+1 FROM cte WHERE n < 5 ) SELECT * FROM cte;
Correct Answer:
A recursive common table expression generating values 1 through 5
Question 4
Which window function assigns consecutive integers to rows within a partition, restarting from 1 in each new partition, with no gaps for ties?
Correct Answer:
ROW_NUMBER()
Question 5
What does the LAG(salary, 2) window function return for a given row?
Correct Answer:
The salary value from the row two positions earlier in the partition
Question 1
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About this Exam

Prepare with the 1Z0-909 Practice Questions - Oracle MySQL 8.0 Database Developer (1Z0-909) Exam practice quiz. This question bank includes 100 questions covering mysql, rows, function, index, and clause. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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1Z0-909 Practice Questions - Oracle MySQL 8.0 Database Developer (1Z0-909) Exam

This practice set contains 100 questions from the matching question bank and focuses on mysql, rows, function, index, and clause. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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