title: Unique constraint violated while insert
body: <p>I'm running this code</p>
  
  <pre><code>INSERT INTO ADW12_DW.WC_MFG SELECT * FROM ADW12_DW.WC_MFG_bkp;
  COMMIT;
  </code></pre>
  
  <p>Prior to this, ADW12_DW.WC_MFG was truncated to update column size. So ADW12_DW.WC_MFG is empty before running the above code.</p>