Preview - Intermediate TSQL Programming - Functions

This is a preview of a lesson that will be part of a module dedicated to SQL Server functions. This module will be part of a course called intermediate TSQL Programming. Check it out and send me some feedback at abobak@grumpyolditguy.com. Let me know if you like it, let me know and suggestions or constructive criticism. I would also love some feedback on the avatars used in the lesson. Are they easy to understand or do they need some work?