title: How to differentiate two tables
body: <p>I have two tables and I want to get all records from one table that are different from the records in second table.</p>
  
  <p>Eg.: if we have four records in the first table like A,B,C,D and three records in the second table thats A,B,C then the answer of query should be D.</p>
  
  <p>I have tried "EXCEPT" operator but it doesn't work fine. Kindly help me in writing correct query for the given problem.</p>