title: How to query using SQLiteDatabase.query
body: <p>How can I make query using SQLiteDatabase.query ?</p>
  
  <pre><code>"Select * from table where col1 = something AND col2 IS NOT NULL"
  </code></pre>
  
  <p>I tried it by putting the col2 with a =? in selection String and NOT NULL in selection argument but it doesn't work.</p>
  
  <p>Please tell me where m going wrong.</p>