title: How to find exact row match using IN in Where clause?
body: <p>I have two tables  tbl_group AND tbl_members.
  Here is snapshot of both the tables.</p>
  
  <pre><code>+----+------------+
  | id | groupTitle |
  +----+------------+
  |  1 | Group 1    |
  |  2 | Group 2    |
  +----+------------+
  
  +----+---------+--------+
  | id | groupId | userId |
  +----+---------+--------+
  |  1 |       1 |      1 |
  |  2 |       1 |      2 |
  |  3 |       1 |      3 |
  |  4 |       2 |      1 |
  |  5 |       2 |      2 |
  +----+---------+--------+
  </code></pre>
  
  <p>Now i want to create one more group with userId 3,2 but before that i want to check that is there any group which has same member 3 and 2 not any other.</p>
  
  <p>i have used IN clause but it does not work.</p>
  
  <pre><code>SELECT DISTINCT groupId 
  FROM tbl_members 
  WHERE userId IN (3,2)
  </code></pre>
  
  <p>It is returning both the group though result would be empty.</p>