SQL join and group -Yuru

part1.sql

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+SELECT customerName, CONCAT(e.lastName, ',', e.firstName) as 'Sales Rep' from customers c LEFT join employees e ON c.salesRepEmployeeNumber=e.employeeNumber ORDER BY customerName

part2.sql

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+SELECT productName AS 'Product Name', quantityordered AS 'Total # Ordered', (quantityordered*priceEach) AS 'Total Sale' 
+FROM orderdetails o LEFT JOIN products p ON o.productCode=p.productCode 
+ORDER BY (quantityordered*priceEach) DESC

part3.sql

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+Select count(*) as '# Orders',status as 'Order Status' from orders group by status ORDER BY status

part4.sql

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+SELECT productLine AS 'Product Line', SUM(quantityordered) AS '# Sold' 
+FROM products 
+LEFT JOIN orderdetails ON products.productCode=orderdetails.productCode 
+GROUP BY productLine 
+ORDER BY 2 DESC

part5.sql

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+select CONCAT(lastName, ',', firstName) AS 'Sales Rep', count(o.orderNumber) as '# Orders', (quantityOrdered*priceEach) as 'Total Sales'
+FROM customers c left join employees e on c.salesRepEmployeeNumber=e.employeeNumber 
+left join orders o on c.customerNumber = o.customerNumber
+LEFT JOIN orderdetails on orderdetails.orderNumber=o.orderNumber
+WHERE e.jobTitle='Sales Rep'
+GROUP BY CONCAT(lastName, ',', firstName)
+order by (quantityOrdered*priceEach) DESC

part6.sql

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+SELECT extract(MONTH FROM paymentdate) as Month,extract(year from paymentdate) as Year, sum(amount) AS 'Payments Received'
+FROM payments
+GROUP BY 1,2