Category: COMPUTER SCIENCE/IT

This is a part of lecture presented by Ms.Rashmi Sharma Asst.proffesor of Biyani girls college. The video is about cryptography And its importance in network security. In cryptography we send the message in encrypted form to the receiver. The aim of cryptography is to provide Authenticity, secrecy, non-repudiation. The video is helpful for BCA students.

Aggregate functions calculate the values of a column and return single value as result.
These are:
1.avg()
2.min()
3.max()
4.count()
5.sum()
6.first()
7.last()