Using Stored Procedures for Efficient Query Execution

Using Stored Procedures for Query Reuse

Write a SQL stored procedure to encapsulate and reuse a frequently executed query.

Solution:

-- Create a stored procedure for retrieving employee details.
CREATE PROCEDURE GetEmployeesByDepartment
    @Department NVARCHAR(50)
AS
BEGIN
    SELECT EmployeeID, Name
    FROM Employees
    WHERE Department = @Department;
END;

-- Execute the stored procedure.
EXEC GetEmployeesByDepartment @Department = 'HR';

Explanation:

• Purpose of the Query :
• The goal is to demonstrate how stored procedures encapsulate logic for reuse and performance optimization.

• CREATE PROCEDURE: Encapsulates the query logic.
• Parameters allow dynamic filtering.

• Stored procedures reduce network traffic by executing queries on the server.
• They promote code reuse and simplify maintenance.

• In enterprise applications, stored procedures centralize business logic.

Notes:

• Stored procedures improve security by restricting direct table access.
• Use them for complex queries or frequently executed operations.
• Important Considerations:
• Avoid hardcoding values inside stored procedures.

For more Practice: Solve these Related Problems:

• Write a SQL stored procedure to retrieve all orders placed by a specific customer, allowing dynamic filtering by customer ID.
• Write a SQL stored procedure to calculate the total sales for a given date range and return the results grouped by product category.
• Write a SQL stored procedure to update employee salaries based on their department and job title, using input parameters for flexibility.
• Write a SQL stored procedure to generate a report of top-performing salespeople for a given month, encapsulating complex logic for reuse.

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