sql join and group queries assignment completed

PART 6.SQL

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+SELECT MONTHNAME(paymentdate) AS 'MONTH', year(paymentDate) AS 'YEAR', SUM(amount) AS 'Payments Received' FROM payments
+GROUP BY MONTH(paymentdate), year(paymentDate);
+

part 1.sql

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+SELECT cus.customerName AS CustomerName,
+CONCAT(emp.lastName,', ',emp.firstName) AS SalesRep
+FROM customers cus JOIN employees emp
+ON cus.salesRepemployeenumber=emp.employeenumber;
+
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part 2.sql

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+SELECT * FROM products;
+
+SELECT * FROM payments;
+SELECT * FROM orderdetails;
+
+SELECT productName AS 'Product Name',(quantityOrdered * priceEach) AS 'Total sale' 
+FROM products JOIN orderdetails ON products.productcode=orderdetails.productcode 
+ORDER BY  (quantityOrdered * priceEach) desc;

part 3.sql

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+SELECT ORDERS.STATUS AS 'Order Status', COUNT(*) AS '#of Orders'  FROM orders
+group BY ORDERS.STATUS
+ORDER BY orders.STATUS;
+
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part 4.sql

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+SELECT products.productLine AS 'Product Line', sum(quantityOrdered) AS '#Sold'
+FROM orderdetails, products,productlines 
+where products.productCode = orderdetails.productcode 
+AND productlines.productline = products.productline
+GROUP BY products.productline
+ORDER BY sum(quantityOrdered) DESC;
+
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+SELECT products.productLine AS 'Product Line', sum(quantityOrdered) AS '#Sold'
+FROM 
+products JOIN orderdetails ON products.productCode = orderdetails.productCode
+JOIN productlines ON productlines.productLine = products.productLine
+GROUP BY products.productline
+ORDER BY sum(quantityOrdered) DESC;
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+--ORDER BY orderdetails.productCode; 
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+SELECT products.productLine, SUM(quantityOrdered) FROM orderdetails, products 
+WHERE  orderdetails.productcode=products.productCode
+GROUP BY orderdetails.productCode
+ORDER BY products.productLine; 
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+SELECT orderdetails.productCode,SUM(orderdetails.quantityOrdered) FROM orderdetails
+GROUP BY orderdetails.productCode
+ORDER BY orderdetails.productCode;
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+SELECT * FROM orderdetails ORDER BY productcode;

part 5.sql

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+SELECT CONCAT(employees.lastName,employees.firstName) AS 'Sales Rep',
+COUNT(quantityOrdered) AS  '#ORDERS',
+NVL((quantityOrdered*priceEach),0.0) AS 'Total Sales'
+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
+WHERE employees.jobTitle = 'Sales Rep'
+GROUP BY CONCAT(employees.employeeNumber) ,'#ORDERS'
+ORDER BY (quantityOrdered*priceEach)  DESC;
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