Introducing the GREATEST and LEAST T-SQL functions

The introduction of these new t-sql functions is a lifesaver. We had to jump through hoops to overcome their omission. Sometimes, we hardcoded this logic using "case when" when performance is critical and other times we used Clr functions for readability. But, all approaches were inelegant and had many limitations such as Clr functions only allowing a fixed number of parameters and data type specific implementations.

Btw, there is a further need for other t-sql functions to be added; at least to match what Oracle has to offer. 

We can provide a list of functions we think would be very helpful additions.