title: Mysql: copy certain columns from one row to another
body: <p>Is there an easy way to as an example copy COL2 and COL3 from row with ID3 to row with ID2 and replace any existing value?</p>
  
  <pre><code>ID---COL1---COL2---COL3
  1.   A        B        C
  2.   D        E        F
  3.   G        H        I
  4.   J        K        L
  </code></pre>