Feat/authors/PauloRC0

authors/PauloRC0/01.sql

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+--1. Liste os produtos. (products)
+SELECT 
+*
+FROM
+products

authors/PauloRC0/02.sql

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+--1.Liste os produtos e o nome de seus fornecedores. (products / suppliers)
+
+SELECT
+
+p.product_name,f.company_name
+
+FROM products as p 
+
+INNER JOIN suppliers as f
+
+ON p.supplier_id = f.supplier_id

authors/PauloRC0/03.sql

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+--2. Recupere os pedidos com os nomes dos clientes e dos funcionários responsáveis. (orders / customers / employees)
+
+SELECT
+
+o.order_id,c.contact_name,f.first_name
+
+FROM orders as o
+
+INNER JOIN customers as c
+
+ON o.customer_id = c.customer_id
+
+INNER JOIN employees as f
+
+ON o.employee_id = f.employee_id

authors/PauloRC0/04.sql

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+--3. Liste os produtos, suas categorias e o nome dos fornecedores. (products / categories / suppliers)
+
+SELECT
+
+p.product_name,c.category_name,f.company_name
+
+FROM products as p
+
+INNER JOIN categories as c
+
+ON p.category_id = c.category_id
+
+INNER JOIN suppliers as f 
+
+ON p.supplier_id = f.supplier_id

authors/PauloRC0/05.sql

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+--4. Quantos pedidos cada cliente já fez? (orders / customers)
+
+SELECT
+
+c.customer_id,COUNT(o.order_id)
+
+FROM orders as o
+
+INNER JOIN customers as c
+
+ON o.customer_id = c.customer_id
+
+GROUP BY c.customer_id

authors/PauloRC0/06.sql

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+-- 5. Valor total vendido por cada funcionário (considerando os pedidos já enviados). (orders / employees) 
+
+SELECT 
+
+f.first_name , SUM(o.unit_price * o.quantity * (1 - o.discount) ) AS total_vendido
+
+FROM employees f
+INNER JOIN orders p ON f.employee_id = p.employee_id
+INNER JOIN order_details o ON p.order_id = o.order_id
+WHERE p.shipped_date IS NOT NULL
+GROUP BY f.first_name
+ORDER BY total_vendido DESC;

authors/PauloRC0/07.sql

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+--6. Média de preços dos produtos por categoria. (products / categories)
+
+SELECT 
+
+c.category_id,AVG(p.unit_price) AS media_produto
+
+FROM products as p 
+
+INNER JOIN categories as c
+
+ON c.category_id = p.category_id
+
+GROUP BY c.category_id
+
+ORDER BY media_produto ASC

authors/PauloRC0/08.sql

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+--7. Quais os clientes que nunca fizeram pedidos? (customers / orders)
+
+SELECT  
+
+c.customer_id,c.contact_name
+
+FROM customers as c 
+
+LEFT JOIN orders as o
+
+ON o.customer_id = c.customer_id
+
+WHERE o.order_id IS NULL