Practice - Advanced SQL Queries
Practice Questions
Test your understanding with targeted questions
Define the COUNT() function in SQL.
💡 Hint: What function counts rows in SQL?
What does the GROUP BY clause do?
💡 Hint: Think of it as organizing data into categories.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does the SUM() function do in SQL?
💡 Hint: Think about what happens when you add values together.
True or False: The GROUP BY clause can be used without aggregate functions.
💡 Hint: Consider the purpose of grouping data.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Write an SQL query using a nested subquery to find the names of employees earning more than the average salary of the company.
💡 Hint: Use a nested SELECT to calculate the average first.
Combine multiple aggregate functions to find the total and average salaries in the IT department.
💡 Hint: Remember to use the appropriate WHERE clause to limit results to the IT department.
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Reference links
Supplementary resources to enhance your learning experience.