title: Finding the rows that are not common in two tables in oracle
body: <p>I have two tables with following values.</p>
  
  <pre><code>tab1              tab2
  ----              ----
  A                   A
  B                   E
  C                   F
  D                   G
  </code></pre>
  
  <p>Output should be as follows:</p>
  
  <pre><code>O/P
  ---
  B
  C
  D
  E
  F
  G
  </code></pre>