Practice Advanced SQL and NoSQL for Data Science - 19 | 19. Advanced SQL and NoSQL for Data Science | Data Science Advance
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19 - Advanced SQL and NoSQL for Data Science

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

Define a subquery and provide an example.

💡 Hint: Think about how filtering works within a query.

Question 2

Easy

What does a CTE do?

💡 Hint: What do we call a temporary result set in SQL?

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 the purpose of a subquery in SQL?

  • To enhance data structure
  • Improve performance
  • Query within a query

💡 Hint: Consider how queries can be layered.

Question 2

True or False: CTEs are only used in nested queries.

  • True
  • False

💡 Hint: Think about the functionality of CTEs beyond nesting.

Solve 2 more questions and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Create a SQL query using a subquery that finds the names of employees who have the highest salary within each department.

💡 Hint: You may need to consider aggregation and grouping functions.

Question 2

Describe how you would use CTEs to find the total sales in each region using sales data.

💡 Hint: Remember the structure of a CTE and how to use the WITH clause.

Challenge and get performance evaluation