Mohammadreza-Nafar-NW5-SQL-Coursework-Week2

2-exercises/task.md

@@ -7,6 +7,7 @@ In this homework, you are going to work with an ecommerce database. In this data
 Below you will find a set of tasks for you to complete to set up a database for an e-commerce app.
 
 To submit this homework write the correct commands for each question here:
+
 ```sql
 
 
@@ -35,16 +36,47 @@ 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`
-4. Retrieve all the products which cost more than 100 showing product id, name, unit price and supplier id.
+<!-- select * from products where product_name like '%socks%'; -->
+4. Retrieve all the products which cost more than 100 showing
+product id, name, unit price and supplier id.
+<!-- select product_availability.prod_id,product_availability.unit_price,produ
+cts.product_name,suppliers.supplier_name from product_availability join products on(produ,
+cts.id=product_availability.prod_id)join suppliers on(suppliers.id=product_availability.
+supp_id)where product_availability.unit_price >100; -->
+
 5. Retrieve the 5 most expensive products
+
+<!-- select p.product_name, pa.unit_price from products p inner join product_availability pa on (p.id=pa.prod_id) order by pa.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 p.product_name, pa.unit_price, s.supplier_name FROM products p JOIN product_availability pa ON p.id = pa.prod_id JOIN suppliers s ON pa.supp_id = s.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`.
-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 p.product_name, s.supplier_name FROM suppliers s JOIN product_availability pa ON s.id = pa.supp_id JOIN products p ON pa.prod_id = p.id WHERE s.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 o.id, o.order_reference, order_date,(oi.quantity * pa.unit_price) as Total_Cost FROM orders o JOIN order_items oi ON o.id = oi.order_id JOIN product_availability pa ON oi.product_id = pa.prod_id WHERE customer_id = 1; -->
+
 9. Retrieve all orders, including order items, from customer named `Hope Crosby`
+<!-- SELECT * FROM customers
+INNER JOIN orders ON customers.id=orders.customer_id
+INNER JOIN order_items ON order_items.order_id=orders.id
+WHERE 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 order_items INNER JOIN products ON order_items.product_id = products.id INNER JOIN product_availability ON order_items.product_id = product_availability.prod_id INNER JOIN orders ON order_items.order_id = orders.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`.
-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, orders.order_reference, orders.order_date, products.product_name, suppliers.supplier_name, order_items.quantity FROM order_items INNER JOIN orders ON order_items.order_id = orders.id INNER JOIN products ON order_items.product_id = products.id INNER JOIN customers ON customers.id = orders.customer_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.
+<!-- SELECT customers.name FROM order_items INNER JOIN orders ON order_items.order_id = orders.id INNER JOIN customers ON orders.customer_id = customers.id INNER JOIN suppliers ON order_items.supplier_id = suppliers.id WHERE suppliers.country = '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, orders.order_reference,orders.order_date, (order_items.quantity * product_availability.unit_price) AS total_amount FROM order_items INNER JOIN orders ON orders.id = order_items.order_id INNER JOIN product_availability ON product_availability.prod_id = order_items.product_id INNER JOIN customers ON customers.id = orders.customer_id ORDER BY total_amount DESC; -->