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This document provides complete and detailed notes on SQL Stored Procedures, covering creation, execution, parameters, and real-world applications. What you will learn: Introduction to Stored Procedures Creating and executing procedures Parameters and dynamic queries Advantages and disadvantages Comparison with functions Real-world use cases
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Contents
1.Introduction to SQL Stored Procedures SQL Stored Procedures are precompiled collections of SQL statements stored inside the database. Instead of writing SQL queries repeatedly, developers can save a set of instructions as a procedure and execute it whenever needed. This makes database operations more efficient, reusable, and organized. In real-world systems, applications often need to perform repetitive database tasks such as inserting records, updating data, or generating reports. Writing the same queries multiple times increases complexity and the chances of errors. Stored procedures solve this problem by encapsulating logic into a single reusable unit. When a stored procedure is executed, the database engine processes it as a compiled object. This reduces execution time compared to running individual queries repeatedly. Stored procedures also help in reducing network traffic because multiple operations can be executed in a single call. Understanding stored procedures is essential for backend development and database optimization. They are widely used in enterprise applications where performance, security, and maintainability are critical.
5. Executing a Stored Procedure Stored procedures are executed using the EXEC or CALL statement depending on the database system. Example: EXEC GetEmployees; Executing a stored procedure runs all the SQL statements defined inside it. This allows multiple operations to be performed in a single call. 6. Parameters in Stored Procedures Stored procedures can accept parameters, making them flexible and reusable. Example: CREATE PROCEDURE GetEmployeeById @id INT AS BEGIN SELECT * FROM employees WHERE id = @id; END; Parameters allow passing values dynamically, making procedures more powerful.
7. Advantages of Stored Procedures Improved performance Code reusability Reduced network traffic Enhanced security Better maintainability 8. Disadvantages of Stored Procedures Harder to debug Database dependency Limited portability Can become complex if overused 9. Stored Procedures vs Functions
