MANCHESTER -CLASS-5-Miguel-Cabral-SQL-Coursework-WEEK-2

2-exercises/task.md

@@ -35,16 +35,99 @@ 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
+A = SELECT name, address FROM customers WHERE country = 'United States';
 2. Retrieve all the customers in ascending name sequence
+A = SELECT * FROM customers ORDER BY name ASC;
 3. Retrieve all the products whose name contains the word `socks`
+A = 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.
+A = 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;
+
 5. Retrieve the 5 most expensive products
+A =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`
+A = 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`.
+A = 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).
+A = 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`
+A = 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`.
+A = 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`.
+A = SELECT customers.name, order_reference, order_date, products.product_name, suppliers.supplier_name,
+order_items.quantity
+FROM orders
+INNER JOIN customers
+ON orders.customer_id = customers.id
+INNER JOIN order_items
+ON orders.id = order_items.order_id
+INNER JOIN products
+ON order_items.product_id = products.id
+INNER JOIN suppliers
+ON order_items.supplier_id = suppliers.id
 12. Retrieve the names of all customers who bought a product from a supplier based in China.
+A = 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.
+A = 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/cyf-ecommerce-api/.gitignore

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