Relational Calculus

Relational Calculus is a formal way of specifying what data you want from a database without stating how to retrieve it. Using principles from logic, it describes conditions and relationships between data. Think of it as expressing questions about information, like "Find all employees who earn more than $50,000" without detailing the specific steps to get that answer. Instead of focusing on the process (how to get data), it emphasizes the desired result, making it useful for defining queries in a clear, logical manner.