Sorry to ask this kind of questions.
But I am eager to know some good sites where I can have the opportunity to have some sql competitions.
I found 1 TroyK's T-SQL Challenge
but it is not free.
I am looking for a free one.
And also C# programming competitions. One I found is Code Chef
I am Looking for some more.
Also, it should be for any ages!
Edited:
I liked Project Euler. It's nice
Also some TSQL programming challenge. Sql Server Central is good. But I am looking for more TSql programs
Thanks in advance