NW5 Manchester - Luan Souza - SQL - Week 2

2-exercises/task.md

@@ -35,16 +35,109 @@ Open the file `cyf_ecommerce.sql` in VSCode and examine the SQL code. Take a pie
 Once you understand the database that you are going to work with, solve the following challenge by writing SQL queries using everything you learned about SQL:
 
 1. Retrieve all the customers' names and addresses who live in the United States
+SELECT name, address FROM customers WHERE country = 'United States';
+
 2. Retrieve all the customers in ascending name sequence
+SELECT * FROM customers ORDER BY name ASC;
+
 3. Retrieve all the products whose name contains the word `socks`
+SELECT * FROM products WHERE lower(product_name) LIKE '%socks%';
+
 4. Retrieve all the products which cost more than 100 showing product id, name, unit price and supplier id.
+SELECT products.id, products.product_name, product_availability.unit_price, product_availability.supp_id
+FROM products
+INNER JOIN product_availability
+ON (products.id = product_availability.prod_id) 
+WHERE product_availability.unit_price > 100;
+
 5. Retrieve the 5 most expensive products
+SELECT products.id, products.product_name, product_availability.unit_price
+FROM products
+INNER JOIN product_availability
+ON (products.id = product_availability.prod_id)
+ORDER BY product_availability.unit_price DESC
+LIMIT 5;
+
 6. Retrieve all the products with their corresponding suppliers. The result should only contain the columns `product_name`, `unit_price` and `supplier_name`
+SELECT products.product_name, product_availability.unit_price, suppliers.supplier_name
+FROM products
+INNER JOIN product_availability
+ON products.id = product_availability.prod_id
+INNER JOIN suppliers
+ON product_availability.supp_id = suppliers.id;
+
 7. Retrieve all the products sold by suppliers based in the United Kingdom. The result should only contain the columns `product_name` and `supplier_name`.
+SELECT products.product_name, suppliers.supplier_name
+FROM products
+INNER JOIN product_availability
+ON products.id = product_availability.prod_id
+INNER JOIN suppliers
+ON product_availability.supp_id = suppliers.id AND suppliers.country = 'United Kingdom';
+
+
 8. Retrieve all orders, including order items, from customer ID `1`. Include order id, reference, date and total cost (calculated as quantity * unit price).
+SELECT orders.id, orders.order_reference, orders.order_date, order_items.quantity * product_availability.unit_price AS total_cost
+FROM orders
+INNER JOIN order_items
+ON orders.id = order_items.order_id
+INNER JOIN product_availability
+ON order_items.product_id = product_availability.prod_id
+WHERE orders.customer_id = 1;
+
 9. Retrieve all orders, including order items, from customer named `Hope Crosby`
+SELECT orders.id, orders.order_reference, orders.order_date, order_items.quantity * product_availability.unit_price AS total_cost
+FROM customers
+INNER JOIN orders
+ON customers.id = orders.customer_id
+INNER JOIN order_items
+ON orders.id = order_items.order_id
+INNER JOIN product_availability
+ON order_items.product_id = product_availability.prod_id
+WHERE customers.name = 'Hope Crosby';
+
 10. Retrieve all the products in the order `ORD006`. The result should only contain the columns `product_name`, `unit_price` and `quantity`.
+SELECT products.product_name, product_availability.unit_price, order_items.quantity
+FROM orders
+INNER JOIN order_items
+ON orders.id = order_items.order_id
+INNER JOIN products
+ON order_items.product_id = products.id
+INNER JOIN product_availability
+ON order_items.product_id = product_availability.prod_id
+WHERE orders.order_reference = 'ORD006';
+
 11. Retrieve all the products with their supplier for all orders of all customers. The result should only contain the columns `name` (from customer), `order_reference`, `order_date`, `product_name`, `supplier_name` and `quantity`.
+SELECT customers.name, orders.order_reference, orders.order_date, products.product_name, suppliers.supplier_name, order_items.quantity
+FROM customers
+INNER JOIN orders
+ON orders.customer_id = customers.id
+INNER JOIN order_items
+ON orders.id = order_items.order_id
+INNER JOIN product_availability
+ON product_availability.prod_id = order_items.product_id
+INNER JOIN products
+ON products.id = product_availability.prod_id
+INNER JOIN suppliers
+ON suppliers.id = product_availability.supp_id;
+
 12. Retrieve the names of all customers who bought a product from a supplier based in China.
-13. List all orders giving customer name, order reference, order date and order total amount (quantity * unit price) in descending order of total.
+SELECT customers.name
+FROM orders
+INNER JOIN customers
+ON orders.customer_id = customers.id
+INNER JOIN order_items
+ON orders.id = order_items.order_id
+INNER JOIN suppliers
+ON order_items.supplier_id = suppliers.id AND suppliers.country = 'China'
+GROUP by customers.name;
 
+13. List all orders giving customer name, order reference, order date and order total amount (quantity * unit price) in descending order of total.
+SELECT customers.name, orders.order_reference, orders.order_date, order_items.quantity * product_availability.unit_price AS total
+FROM orders
+INNER JOIN customers
+ON orders.customer_id = customers.id
+INNER JOIN order_items
+ON orders.id = order_items.order_id
+INNER JOIN product_availability
+ON order_items.product_id = product_availability.prod_id
+ORDER BY total DESC;

3-projects/.gitignore

@@ -0,0 +1 @@
+/node_modules