Practice LEFT JOIN - 2.2 | SQL for Business Analysts | Business Analysis
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2.2 - LEFT JOIN

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What does a LEFT JOIN do in SQL?

💡 Hint: Think about the tables involved and which records are included.

Question 2

Easy

In which scenario would you prefer using LEFT JOIN over INNER JOIN?

💡 Hint: Consider what happens when there's missing data.

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 does LEFT JOIN return when there are no matching records in the right table?

  • Only matching records
  • All records from the left table
  • No records

💡 Hint: Consider what LEFT stands for in LEFT JOIN.

Question 2

True or False: LEFT JOIN omits records from the left table if there are no matches in the right table.

  • True
  • False

💡 Hint: Reflect on the definition and purpose of LEFT JOIN.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Suppose you have two tables: 'employees' and 'departments'. Write a LEFT JOIN query to list all employees and their departments, ensuring to include employees who might not belong to any department.

💡 Hint: Consider how employees relate to departments.

Question 2

Imagine you are analyzing a customer database where some customers have not made any purchases. Formulate a LEFT JOIN query that tallies the purchases made by each customer and returns all customers regardless of whether they made a purchase or not.

💡 Hint: Remember to group your results to get counts.

Challenge and get performance evaluation