Practice Inner Join (2.1) - SQL for Business Analysts

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8 questions

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6 sample questions

Question 1.
What does INNER JOIN do in SQL?
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Think about how it relates to two sets of data.
Question 2.
Write a basic INNER JOIN query to retrieve names from two related tables.
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Follow the structure of SELECT, FROM, JOIN.
3Question 3.
What is the purpose of INNER JOIN?
- To merge tables
- To retrieve records with matching values
- To sort data
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Focus on what INNER JOIN filters out.
4Question 4.
True or False: INNER JOIN will return records even if there are no matches in both tables.
- True
- False
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Recall how INNER JOIN functions.
Question 5.
Write an INNER JOIN query that retrieves names and addresses of customers who have more than 3 orders.
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You need to group and filter based on the order count.
Question 6.
Discuss how you would optimize an INNER JOIN query for large datasets.
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Think about database performance best practices.

4 more questions in this section. Enroll free to practise them all.