title: how to use where clause to check value exist in array in postgres
body: <pre><code> actName |       applicable       | status | id | 
  -----------------------------------------------------
     test1 | {"applicable":[1,3,7]} |      1 |  1 | 
     test2 | {"applicable":[5,4,1]} |      1 |  2 |
  </code></pre>
  
  <p>Is it possible to check value in array <strong>applicable</strong>? E.g. if I try to find which row contains integer  value <code>3</code> in row column <strong>applicable</strong> then it must returns one row that is first row.</p>
  
  <p>result : <br></p>
  
  <pre><code> actName |       applicable       | status | id | 
  -----------------------------------------------------
     test1 | {"applicable":[1,3,7]} |      1 |  1 | 
  </code></pre>