title: If not or if not exist
body: <p>All theses tables <code>ERTBatches</code>, <code>ERTBatchChecks</code>, <code>ERTClaims</code> have an identifier.<br/>
  Lets say the identifier is 1010.<br/>
  This identifier must exist in all three tables.<br/>
  <br/>
  I'm trying to find out if any identifer is not in all three tables.<br/>
  <br/>
  These are the names of the Identifiers :<br/></p>
  
  <pre><code>ERTBatches."BatchIdentifier"
  ERTClaims."ERTBatchNumber"
  ERTBatchChecks."BatchIdentifier"
  </code></pre>