Finished 6 parts of Join and Group

part1.sql

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

part2.sql

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+SELECT products.productName AS "Product Name", orderdetails.quantityOrdered AS "Total # Ordered", 
+CONCAT (orderdetails.quantityOrdered * orderdetails.priceEach) AS "Total Sale"
+FROM products
+LEFT JOIN orderdetails
+ON products.productCode=orderdetails.productCode
+ORDER BY (orderdetails.quantityOrdered * orderdetails.priceEach) DESC;

part3.sql

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

part4.sql

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+
+SELECT products.productLine AS "Product Line", orderdetails.quantityOrdered AS "# Sold"
+FROM products
+LEFT JOIN orderdetails
+ON products.productCode = orderdetails.productCode
+ORDER BY orderdetails.quantityOrdered DESC;

part5.sql

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+SELECT CONCAT(employees.lastName,", ", employees.firstName) AS "Sales Rep", IFNULL(orderdetails.quantityOrdered, 0) AS "# Orders", 
+IFNULL(orderdetails.priceEach * orderdetails.quantityOrdered, 0) AS "Total Sale"
+FROM employees
+LEFT JOIN customers
+ON employees.employeeNumber=customers.salesRepEmployeeNumber
+
+LEFT JOIN orders 
+ON customers.customerNumber=orders.customerNumber
+
+LEFT JOIN orderdetails
+ON orders.orderNumber=orderdetails.orderNumber
+
+GROUP BY employees.employeeNumber
+ORDER BY (orderdetails.priceEach * orderdetails.quantityOrdered) DESC;

part6.sql

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+SELECT MONTH(payments.paymentDate) AS "Month", YEAR(payments.paymentDate) AS "Year", 
+payments.amount AS "Payments Received"
+
+FROM payments
+
+ORDER BY payments.paymentDate ASC;