SQL & Data Management

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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, 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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