Write a SQL query to find the second-highest salary from an Employee table without using LIMIT. Given a Sales table with Date, Product_ID, and Revenue,
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- Given a
Salestable withDate,Product_ID, andRevenue, write a query to find the cumulative revenue per product over time. - Design a normalized database schema for an e-commerce application handling customers, orders, and payments.
- Implement a stored procedure to automatically update product stock levels after a purchase.
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