9 SQL 'Must Know' Interview Questions & Answers.

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These are Level 1 Challenging Questions

Follow along and practice the 9 questions below:

3:10 Find the Customer with a number of orders sorted in descending order
5:38 Find the customer ID with the maximum number of orders
7:23 Find the customer's name and ID with number of orders
10:54 Find the customer's name and ID with number off products purchased in a single order
15:24 Find the Average order per total customer for every employee ID and filter values greater than 1.8
18:04 Find the number of Order by each employee month by month basis and place as premium customer flag with order more than 5 month by month
22:11 Find employees that were born after 1960
25:18 Compare Sales of different products in a pairwise table
29:28 Find Pair of Products with the highest differences in sales

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[MrLeito]

Your solution for #4 groups the results by CustomerName, CustomerID, and OrderID, which means it's counting the number of distinct products for each combination of customer and order, rather than counting the number of products purchased in a single order transaction by each customer. Sorry, but it's either your solution is wrong or your question is wrong.