title: Select from certain categories
body: <p>I have 5 categories in database and I'm trying to display 4 of them. Basically I don't want to show rows from table that have <code>category=1</code>. This is what I try</p>
  
  <pre><code>SELECT * FROM posts WHERE category IN  (2, 7, 8, 9) ORDER BY RAND()
  </code></pre>
  
  <p>but is still showing rows(items) which are from category 1.</p>