title: FQL query to fetch only those records which have a birthday.
body: <p>I want to fetch only those records from fb which have a birthday specified, I dont want null records. I have the following query:</p>
  
  <pre><code>String fqlQuery = "{" +
                          "'friends':'SELECT uid2 FROM friend WHERE uid1 = me()'," +
                          "'friendinfo':'SELECT uid, name, pic_square, birthday FROM user WHERE uid IN" +
                          "(SELECT uid2 FROM #friends)'," + 
                          "}";
  </code></pre>
  
  <p>it fetches everything, I tried the following: </p>
  
  <pre><code>String fqlQuery = "{" +
                          "'friends':'SELECT uid2 FROM friend WHERE uid1 = me()'," +
                          "'friendinfo':'SELECT uid, name, pic_square, birthday FROM user WHERE uid IN" +
                          "(SELECT uid2 FROM #friends)'," + "AND birthday != null"+
                          "}";
  </code></pre>
  
  <p>It does not give me any result, what is the correct way of doing this? </p>