SELECT customer.LastName, COUNT(Orders.OrderID) As NumberOfOrders FROM orders, customers WHERE customer.customerID = Orders.CustomerID GROUP BY LastName HAVING COUNT(Orders.OrderID) > 18; a) What is the purpose of the COUNT function in this SQL statement? 2 b) What is the purpose of the GROUP BY command in this SQL statement? 3 c) What is the purpose of the HAVING command in this SQL statement? 3 d) How would you modify this SQL query so that it shows the orders for customers 2 called ‘Smith’ regardless of how many orders have been made?

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A: 1.

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Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.