title: Is it possible to use Aggregate function in a Select statment without using Group By clause?
body: <p>So far I have written Aggregate function followed by Group By clause to find the values based on SUM, AVG and other Aggregate functions. I have a bit confusion in the Group By clause.
  When we use Aggregate functions what are the columns I need to specify in the Group By clause.
  Otherwise Is there any way to use Aggregate functions without using Group By clause.</p>