Fwrw

authors/fwrw/01.sql

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+-- Liste os produtos. (products)
+SELECT 
+	product_name
+FROM products;

authors/fwrw/02.sql

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+-- Liste os produtos e o nome de seus fornecedores. (products / suppliers)
+SELECT
+	products.product_name as produto,
+	suppliers.company_name as fornecedor
+FROM products
+LEFT JOIN suppliers on suppliers.supplier_id = products.supplier_id

authors/fwrw/03.sql

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+-- Recupere os pedidos com os nomes dos clientes e dos funcionários responsáveis. (orders / customers / employees)
+SELECT
+	orders.order_id,
+	customers.contact_name as cliente,
+	employees.first_name as funcionario
+FROM orders
+LEFT JOIN customers ON customers.customer_id = orders.customer_id
+LEFT JOIN employees ON employees.employee_id = orders.employee_id

authors/fwrw/04.sql

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+-- Liste os produtos, suas categorias e o nome dos fornecedores. (products / categories / suppliers)
+SELECT 
+	products.product_name, categories.category_name, suppliers.company_name
+FROM products
+LEFT JOIN categories on categories.category_id = products.category_id
+LEFT JOIN suppliers ON suppliers.supplier_id = products.supplier_id

authors/fwrw/05.sql

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+-- Quantos pedidos cada cliente já fez? (orders / custoers)
+SELECT 
+	customers.company_name,
+	COUNT(orders.order_id) as total_pedido
+FROM customers
+LEFT JOIN orders on orders.customer_id = customers.customer_id
+GROUP BY customers.company_name
+ORDER BY total_pedido DESC

authors/fwrw/06.sql

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+-- Valor total vendido por cada funcionário (considerando os pedidos já enviados). (orders / employees)
+SELECT 
+	employees.first_name, 
+	SUM(orders.freight) AS total
+FROM employees
+LEFT JOIN orders ON employees.employee_id = orders.employee_id
+WHERE orders.shipped_date IS NOT NULL
+
+GROUP BY employees.employee_id
+ORDER BY total DESC;

authors/fwrw/07.sql

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+-- Média de preços dos produtos por categoria. (products / categories)
+select 
+ categories.category_name, avg(unit_price)
+from products
+left join categories on products.category_id = categories.category_id
+group by categories.category_name
+order by categories.category_name ASC

authors/fwrw/08.sql

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+-- Quais os clientes que nunca fizeram pedidos? (customers / orders)
+select 
+	customers.contact_name
+from customers 
+left join orders on customers.customer_id = orders.customer_id
+where orders.customer_id is null;