Those who read my blog are for sure know my very good friend Jacob Sebastian. He is SQL Server MVP and founder of wonderful site T-SQL Challenges. No matter how expert we are, challenges are made to make us think and try to go to next level. There are certain people who writes always challenging code, however there are many who are yet not expert but the passion of T-SQL is on them. Jacob has many wonderful ideas and T-SQL challenge is his contribution to community, where he helps community to think, help them to mentor and help them to become one better coder.