Given the following ER diagram:
And given the following information: • created_at fields have a timestamp of the time at which a row was inserted in a table for the first time. • product_sku is unique for every product. • product_family_handle is unique for every product family. • Subscription status can be: ‘paused’, ‘cancelled’ or ‘active’. • The fk_product field in the order table indicates the product that was purchased in an order. The fk_product_subscribed_to in the subscription table indicates the product a subscription is currently subscribed to. A subscription can change the product it is subscribed to at any moment. • An order is generated when a box is shipped to a customer
Write SQL statements to retrieve the following information: • For the customer with email address ‘fancygirl83@hotmail.com’ show all product_skus the customer has an active subscription for. Select product_sku From product Inner join subscription on product.id_product = subscription. id_product Inner join customer on subscription.id_customer = customer.id_customer Where email = ‘fancygirl83@hotmail.com’ and status = “active”
• Get all the customers that have an active subscription to a product that corresponds to a product family with product_family_handle = ‘classic-box’
Select id_customer, first_name, last_name From customer Inner join subscription on customer.id_customer = subscription.id_customer Inner join product on subscription.id_product = product.id_product Inner join product_family on product.id_product_family=product.id_product_family Where product_family_handle = ‘classic-box’
• Get all the paused subscriptions that have only received one box.
Select status From subscription Inner join order on subscription.id_subscription=order.id_subscription Where status = “paused” and order_number = “received one box”
• How many subscriptions do our customers have on average?
Select avg (id_subscription) From subscription Where status = “active”
• How many customers have ordered more than one product?
Select count (id_customer) as customer_count From customer Inner join subscription on customer.id_customer = subscription.id_customer Inner join product on subscription.id_product = product.id_product Inner join order on product.id_order=order.id_order Where count (id_order) =! “1”
• How many customers have ordered more that one product with the same subscription?
Select count (id_customer) as customer_count From customer Inner join subscription on customer.id_customer = subscription.id_customer Inner join product on subscription.id_product = product.id_product Inner join order on product.id_order=order.id_order Where count (id_order) =! “1”
• Get a list of all customers which got a box delivered to them two weeks ago, and the count of boxes that had been delivered to them up to that week (loyalty)
• For all our customers, get the date of the latest order delivered to them and include associated product_sku, delivery_date and purchase price. If there were two orders delivered to the same customer on the same date, they should both appear.