Welcome to our SQL Advanced Training Course! This guide will help you master the more complex aspects of SQL, including advanced queries, performance tuning, and security.

Course Outline

  • Advanced Queries 📊

    • Subqueries
    • Joins (INNER, LEFT, RIGHT, FULL)
    • Aggregation Functions (SUM, AVG, COUNT, etc.)
    • Window Functions

  • Performance Tuning 🚀

    • Indexing Strategies
    • Query Optimization
    • Database Design Best Practices

  • Security 🛡️

    • Access Control
    • Data Encryption
    • Auditing and Logging

Why Learn SQL Advanced?

SQL is a fundamental skill for any database professional. Advanced SQL knowledge will enable you to:

  • Write more efficient and powerful queries.
  • Optimize database performance.
  • Ensure data security and compliance.

Learn More

For more detailed information and resources, please visit our SQL Tutorial.

Here is an example of an advanced SQL query using a subquery:

SELECT 
  department_id, 
  AVG(salary) AS average_salary
FROM 
  employees
WHERE 
  department_id IN (
    SELECT 
      department_id 
    FROM 
      departments 
    WHERE 
      location = 'New York'
  )
GROUP BY 
  department_id;

Note: The example above uses a subquery to calculate the average salary for employees in departments located in New York.