title: How does SELECT from two tables separated by a comma work? (SELECT * FROM T1, T2)
body: <p>Given 2 tables T1 and T2.</p>
  
  <pre><code>T1   T2 
  ---------
  A    1 
  B    2
  C    3
  </code></pre>
  
  <p>You make a query:</p>
  
  <pre><code>SELECT * 
    FROM T1, T2
  </code></pre>
  
  <p>What is the no: of rows that are fetched from this query? </p>
  
  <pre><code>(a) 4
  (b) 5
  (c) 6
  (d) 9
  </code></pre>
  
  <h2>Answer is : 9</h2>
  
  <h2>Question:</h2>
  
  <p>Why is the answer "9"?</p>