title: Not equal to string value not working on postgreSQL
body: <p>I've written a very simple query</p>
  
  <pre><code>select *, "Status" from "ABC" WHERE "ABCId" = 7; // Got 100 rows
  </code></pre>
  
  <p>ABC table has some columns one of them is "Status" with null value usually appearing as (Null)</p>
  
  <p>When I try these queries</p>
  
  <pre><code>-- 1
  select * FROM "ABC" where "ABCId" = 7 AND "Status" &lt;&gt; 'success'
  
  -- 2
  select * FROM "ABC" where "ABCId" = 7 AND "Status" != 'success'
  
  -- 3
  select * FROM "ABC" where "ABCId" = 7 AND "Status" NOT ILIKE '%success%'
  </code></pre>
  
  <p>I'm not getting any rows, I bang my head, this is a simple query :/</p>