title: Copy Column Value from One table into Another Matching IDs
body: <p>I have two tables </p>
  
  <pre><code> t1
          id  |  value
          1   |   -
          2   |   -
   t2
         parent_id  |  p_value
          1         |   254
          2         |   124
  </code></pre>
  
  <p>I want to copy the column <code>p_value</code> from t2 into t1 where <code>parent_id = id</code> </p>