How can I design database structure for exercises in SoloLearn

Question

Hi there, I'm working on my final year project which is an educational framework. If I have execise like fill the blank as following :
int x = 0;
__( int i=0; i<5;i++)
Console.WriteLine(__++);
How many tables do I need?
What are their names?
What is the relationship between them?
I hope that you help me.
Sorry for my bad English.