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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does the ROW_NUMBER() function do?
💡 Hint: Think about how you would number items in a list.
Question 2
Easy
Explain what a window function is.
💡 Hint: It's about looking at groups of rows.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is a primary feature of window functions?
- They aggregate data
- They perform calculations without collapsing output
- They join tables
💡 Hint: Remember how aggregation would work differently!
Question 2
True or False: The RANK() function can assign the same rank to multiple rows if their values are equal.
- True
- False
💡 Hint: Think about how ranking works in a competition.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a SQL statement that retrieves employee names and their salaries, ranked within their departments, using the RANK() function. How would you ensure departments with no employees are included?
💡 Hint: Consider how joins and window functions work together.
Question 2
Analyze a dataset of sales over the last year. Write a query using LAG() to find out the month-over-month percentage change in sales.
💡 Hint: Think about how to calculate the difference over time.
Challenge and get performance evaluation