Given a database with tables for Orders , Customers , Products , and OrderDetails , write complex SQL queries to Find the total revenue generated by each product category in the last quarter List the top 5 customers by total purchase amount within the last year Identify products that have never bee...

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Given a database with tables for Orders , Customers , Products , and OrderDetails , write complex

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Given a database with tables for Orders, Customers, Products, and OrderDetails, write complex SQL queries to:
- Find the total revenue generated by each product category in the last quarter.
- List the top 5 customers by total purchase amount within the last year.
- Identify products that have never been ordered.
- Calculate the average time between order placement and shipment for orders shipped last month.