title: INNER JOIN on multiple columns with multiple matches
body: <p>How to find what rows got exact one match and what rows got more than one match in a INNER JOIN ?</p>
  
  <pre><code>SELECT A.Col1, B.Col2 FROM A INNER JOIN B
  ON A.Col3 = B.Col3 AND A.Col4 = B.Col4;
  </code></pre>
  
  <p>As we know INNER JOIN returns rows with minimum one match, so to again reiterate my qustion, how to find which rows matched once and which rows got more than one match.</p>
  
  <p>Regards,
  Sachin</p>