Quiz: Creating analyses from multiple queries

This quiz will test your understanding about Creating analyses from multiple queries. Please answer the following 3 questions.

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Question 1 of 3

1. Question
Consider this query:
SELECT CustomerID, CompanyName
FROM Customers
WHERE Country = ‘USA’
UNION ALL
SELECT CustomerID, CompanyName
FROM Customers
WHERE Country = ‘Canada’
Which of the following statements is true?
- UNION ALL is used to remove duplicate rows from the result set.
- UNION ALL is used to combine the result sets of two SELECT statements.
- UNION ALL is used to combine the result set in ascending order.
- UNION ALL is used to combine the result set based on a condition.
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Question 2 of 3

2. Question
Consider this query:
SELECT c.customerName, COUNT(o.orderID)
FROM customers c
LEFT JOIN orders o ON c.customerID = o.customerID
GROUP BY c.customerName.
Which of the following statements is true?
- This query returns a list of all customers and the number of orders they have placed
- This query returns only the customers who have placed at least one order, along with the number of orders they have placed
- This query returns only the customers who have not placed any orders
- This query returns an error because the GROUP BY clause is incorrect
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Question 3 of 3

3. Question
Which of the following statements is true about common table expressions (CTEs)?
- CTEs are temporary tables that can only be used in the current session.
- CTEs are used to simplify complex queries by breaking them down into smaller, more manageable parts.
- CTEs are used to create permanent tables in the database.
- CTEs can only be used with the SELECT statement.
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