Count duplicate entries with a special condition in MYSQL?

Select link, count( distinct category_id ) sum_of_categories from links_table group by link.

Thanks for the quick reply, this works perfectly! I was about to write a reeealy complex subquery monster out of this... – Gergely Havlicsek Apr 12 at 15:44.

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.