I understand that schema less databases are called no SQL dbs and monogo db is one of them. Is mongodb the most popular one? How does it compare with other no SQL databases ?
I'd say that MongoDB is the one with the widest uptake. Each one has its own strengths and weaknesses; the video linked above is probably a good starting point.
no wonder he is so sad, he hasn't seen this tiny ad:
a bit of art, as a gift, that will fit in a stocking