NW5/Sahar Karimi/SQL-Coursework/Week2

2-exercises/cyf_ecommerce.sql

@@ -121,4 +121,3 @@ INSERT INTO order_items VALUES (16, 8, 1, 4, 1);
 INSERT INTO order_items VALUES (17, 9, 6, 4, 2);
 INSERT INTO order_items VALUES (18, 10, 6, 2, 1);
 INSERT INTO order_items VALUES (19, 10, 4, 1, 5);
-

2-exercises/task.md

@@ -8,6 +8,78 @@ Below you will find a set of tasks for you to complete to set up a database for
 
 To submit this homework write the correct commands for each question here:
 ```sql
+1-SELECT name,address FROM customers WHERE country='United States'; 
+2- SELECT * FROM customer ORDER BY name ASC ; 
+3-SELECT * FROM products WHERE product_name ILIKE '%socks%'; 
+4-SELECT product_availability.prod_id,product_name,product_availability.unit_price, product_availability.supp_id 
+FROM products
+INNER JOIN product_availability
+ON product_availability.prod_id=products.id
+WHERE unit_price>100 
+5-SELECT product_name FROM products
+INNER JOIN product_availability
+ON product_availability.prod_id=products.id
+ORDER BY unit_price DESC 
+LIMIT 5;
+6-SELECT DISTINCT products.product_name, product_availability.unit_price, suppliers.supplier_name
+FROM products
+INNER JOIN product_availability
+ON product_availability.prod_id=products.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 product_availability.prod_id=products.id
+INNER JOIN suppliers
+ON product_availability.supp_id=suppliers.id
+WHERE country='United Kingdom';
+
+8- Retrieve all orders, including order items, from customer ID Include order id, reference, date and total cost (calculated as quantity * unit price).
+SELECT orders.id,orders.order_date,orders.order_reference, (order_items.quantity * product_availability.unit_price) AS total_cost
+FROM orders
+INNER JOIN order_items ON order_items.order_id=orders.id
+INNER JOIN product_availability ON product_availability.prod_id=order_items.product_id
+WHERE orders.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 orders
+INNER JOIN order_items ON orders.id = order_items.order_id
+INNER JOIN products ON products.id = order_items.product_id
+INNER JOIN product_availability ON product_availability.prod_id = order_items.product_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 products ON products.id = order_items.product_id
+INNER JOIN suppliers ON suppliers.id =order_items.supplier_id;
+
+12-Retrieve the names of all customers who bought a product from a supplier based in China.
+SELECT customers.name
+FROM suppliers
+INNER JOIN order_items ON suppliers.id = order_items.supplier_id
+INNER JOIN orders ON order_items.order_id = orders.id
+INNER JOIN customers ON customers.id = orders.customer_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,(quantity * unit_price) AS total_amount 
+FROM customers
+INNER JOIN orders ON orders.customer_id = customers.id
+INNER JOIN order_items ON order_items.order_id = orders.id
+INNER JOIN product_availability ON order_items.product_id = product_availability.prod_id 
+ORDER BY total_amount DESC;
 
 
 ```
@@ -28,13 +100,14 @@ Import the file [`cyf_ecommerce.sql`](./cyf_ecommerce.sql) in your newly created
 psql -d cyf_ecommerce -f cyf_ecommerce.sql
 ```
 
-Open the file `cyf_ecommerce.sql` in VSCode and examine the SQL code. Take a piece of paper and draw the database with the different relationships between tables (as defined by the REFERENCES keyword in the CREATE TABLE commands). Identify the foreign keys and make sure you understand the full database schema.
+Open the file `cyf_ecommerce.sql` in VSCode and examine the SQL code. Take a piece of paper and draw the database with the different relationships between tables (as defined by the REFERENCES keyword in the CREATE TABLE commands). Identify the foreign keys and make sure you understand the full database schema
 
 ## Task
 
 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
+
 2. Retrieve all the customers in ascending name sequence
 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.
@@ -47,4 +120,3 @@ Once you understand the database that you are going to work with, solve the foll
 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.
-