SQL Tutoring: Advanced Techniques for Intermediates

I'm an intermediate SQL user seeking a SQL professional to provide tutoring classes focused on advanced SQL techniques.

The ideal candidate should:
- Currently be working on SQL projects
- Have substantial knowledge of advanced SQL techniques
- Be able to explain complex concepts in an easy-to-understand manner

I specifically want to deepen my understanding of:
- Advanced SQL techniques
- Performance tuning and optimization
- Advanced joins and subqueries

I am looking for someone who can help me enhance my skills and understanding to a more advanced level.