COUNT(id) vs. COUNT(*) in MySQL

Question

Is there a difference between the following queries, assuming there is a primary field \'id\' in the table (as in speed, etc)?

SELECT COUNT(id) 
  FROM table         


        

Answer 1

Count(*) Count(Ename) Can show diff outputs because Ename is not a column with Not null constraint and it surely be having some null values Which are not being counted.

Hope it helps..!