2026

Technology & Programming

Expert SQL Databases Hardcore Challenge

Probe deep into SQL intricacies covering performance tuning, advanced functions, and transaction management for true database specialists.

#Advanced SQL#Correlated Subqueries#Hash Indexes#Isolation Levels#Recursive CTEs#Window Functions#Database Optimization

Quiz Intelligence

Total Questions

6

Difficulty Level

hard

Progress

0/0

0%

Quiz Questions

Answer all questions below and test your knowledge.

1
Which isolation level blocks dirty reads while permitting non-repeatable reads and phantom reads?
Question 1
2
Which window function generates a unique consecutive integer for each row in the partition, ignoring duplicate values?
Question 2
3
In a recursive CTE, what operator must connect the anchor member to the recursive member?
Question 3
4
Which index structure excels at equality lookups but performs poorly on range scans?
Question 4
5
How many times does a correlated subquery execute relative to the outer query?
Question 5
6
What does the FETCH FIRST n ROWS ONLY clause achieve in standard SQL?
Question 6

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Expert SQL Databases Hardcore Challenge

Quiz Intelligence

Quiz Questions

Which isolation level blocks dirty reads while permitting non-repeatable reads and phantom reads?

Which window function generates a unique consecutive integer for each row in the partition, ignoring duplicate values?

In a recursive CTE, what operator must connect the anchor member to the recursive member?

Which index structure excels at equality lookups but performs poorly on range scans?

How many times does a correlated subquery execute relative to the outer query?

What does the FETCH FIRST n ROWS ONLY clause achieve in standard SQL?