title: Creating a Trigger which will insert record in a table on update of another table
body: <p>Suppose I have tables T1 and T2 </p>
  
  <pre><code>Columns of T1 --&gt;Value
  Columns of T2 --&gt;OldValue NewValue
  </code></pre>
  
  <p>What I require is a trigger which will insert a record in T2 on updation of T1 , I need to know the old value and new value also , I have never used triggers before , so can any help me with this , how do I go about creating this trigger.Is it possible ,thanks.</p>