In an Oracle database, what is the difference between ROWNUM and ROW_NUMBER?

Question

What is the difference between ROWNUM and ROW_NUMBER ?

Answer 1

Apart from the other differences mentioned in answers, you should also consider performance. There is a non-authoritative but very interesting report here, comparing various means of pagination, among which the use of ROWNUM compared to ROW_NUMBER() OVER():

http://www.inf.unideb.hu/~gabora/pagination/results.html