Feat/authors/feliperasilva

authors/feliperasilva/feliperomero01.sql

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+SELECT * FROM products

authors/feliperasilva/feliperomero02.sql

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+SELECT products.product_name, suppliers.company_name
+FROM products
+INNER JOIN suppliers ON products.supplier_id = suppliers.supplier_id;

authors/feliperasilva/feliperomero03.sql

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+SELECT orders.order_id, employees.first_name, customers.contact_name
+FROM orders
+INNER JOIN employees ON orders.employee_id = employees.employee_id
+INNER JOIN customers ON orders.customer_id = customers.customer_id;

authors/feliperasilva/feliperomero04.sql

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+SELECT products.product_id, products.product_name, categories.category_name, suppliers.company_name
+FROM products
+INNER JOIN categories ON products.category_id = categories.category_id
+INNER JOIN suppliers ON products.supplier_id = suppliers.supplier_id;

authors/feliperasilva/feliperomero05.sql

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+SELECT customers.customer_id,COUNT(orders.order_id)
+FROM orders 
+INNER JOIN customers ON orders.customer_id = customers.customer_id
+GROUP BY customers.customer_id

authors/feliperasilva/feliperomero06.sql

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+SELECT employees.first_name, SUM(order_details.unit_price * order_details.quantity * (1 - order_details.discount) ) AS valor_total
+FROM employees 
+INNER JOIN orders ON employees.employee_id = orders.employee_id
+INNER JOIN order_details  ON orders.order_id = order_details.order_id
+WHERE orders.shipped_date IS NOT NULL
+GROUP BY employees.first_name
+ORDER BY valor_total DESC;

authors/feliperasilva/feliperomero07.sql

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+SELECT categories.category_id,AVG(products.unit_price) AS media_produto
+FROM products
+INNER JOIN categories ON categories.category_id = products.category_id
+GROUP BY categories.category_id
+ORDER BY media_produto ASC

authors/feliperasilva/feliperomero08.sql

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+SELECT customers.customer_id
+FROM customers
+LEFT JOIN orders ON customers.customer_id = orders.customer_id
+WHERE orders.order_id IS NULL;