title: Update a third table by comparing values of two tables using triggers
body: <p>Hii</p>
  
  <p>I have three tables (Table1, Table2, Table3).All the three tables have same column names(Company, License_count). when an update will happen in table2, trigger will compare the values of table2 &amp; table1 and insert the difference into table three. I have to do this only for single row.</p>
  
  <p>Can anyone help?</p>