title: Why 'No math function In Where Clause' in MS SQL?
body: <p>Most of SQL queries have no math operation on where clause.  </p>
  
  <p>What is wrong having them on 'where clause'?
  Is there any performance issue?</p>
  
  <p>Eg:</p>
  
  <p>SELECT * FROM Employee WHERE Salary*3 = 5000</p>