Then you have to apply grouping first on flag then on day.
Your question is not very clear but I think this might help.. SELECT COUNT(DISTINCT name), DATE(time) as day FROM table GROUP BY day HAVING FLAG=0 and FLAG=1.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.