SQL Join and Group

part1/part1.sql

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+SELECT customers.customerName, 
+CONCAT (employees.lastName, ', ', employees.firstName) AS "Sales Rep"
+FROM customers
+INNER JOIN employees
+ON customers.salesRepEmployeeNumber=employees.employeeNumber
+ORDER BY customerName ASC;

part2/part2.sql

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+SELECT p.productName, od.quantityOrdered AS "Total # Ordered", od.quantityOrdered * od.priceEach AS "Total Sale"
+FROM products p JOIN orderdetails od 
+ON p.productCode=od.productCode
+ORDER BY od.quantityOrdered * od.priceEach DESC;

part3/part3.sql

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+SELECT STATUS AS "Order Status" , COUNT(orderNumber) AS "# Orders"
+FROM orders
+GROUP BY STATUS
+ORDER BY STATUS ASC;

part4/part4.sql

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+SELECT productLine, COUNT(quantityOrdered) AS "# Sold"
+FROM products JOIN productlines USING(productLine)
+JOIN orderdetails USING(productCode)
+GROUP BY productLine
+ORDER BY 2 DESC; 

part5/part5.sql

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+SELECT CONCAT(e.lastName, ", ", e.firstName) AS "Sales Rep",
+COUNT(o.orderNumber) AS "# Orders", SUM(IFNULL(od.quantityOrdered * od.priceEach, 0)) AS "Total Sales" 
+FROM employees e LEFT JOIN customers c ON e.employeeNumber=c.salesRepEmployeeNumber
+LEFT JOIN orders o ON o.customerNumber=c.customerNumber
+LEFT JOIN orderdetails od ON od.orderNumber=o.orderNumber
+WHERE e.jobTitle="Sales Rep" 
+GROUP BY 1
+ORDER BY 3 DESC;

part6/part6.sql

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+SELECT MONTHNAME(paymentDate) AS "Month", YEAR(paymentDate) AS "Year",
+ROUND(amount, 2) AS "Payments Received"
+FROM payments