title: how to filter a table that having exactly the specified values in tsql
body: <p>I need to filter a table with exact values.
  I have googled almost a day now, I wonder if you guys can help me</p>
  
  <p>I have a table like this:</p>
  
  <pre><code>    ID  |  group ID  | tax Id
      -------------------------
      1   |  1         | 1
      2   |  2         | 1
      3   |  2         | 2
      4   |  3         | 2
      5   |  3         | 3
      6   |  3         | 4
      7   |  4         | 1
      8   |  4         | 4
      9   |  5         | 2
     10   |  5         | 4
     11   |  6         | 3
     12   |  6         | 4
  </code></pre>
  
  <p>I need to get the group Id only when the tax ids are exactly 2,3, and 4, which is group id 3.<br/>
  If I put WHERE TAX_ID IN (2,3,4) I will get these tax groups back 3,5,6.<br/>
  What I want is just tax group 3 only.<br/>
  I hope this is not a duplicate question, since I could not find when I Google it.</p>