title: FQL get post information from post id using stream table
body: <p>I have a post id and I want to run an FQL query to get information about it. The logical query, I thought would be</p>
  
  <pre class="lang-sql prettyprint-override"><code>SELECT comment_info,
         like_info,
         created_time,
         attachment etc.. 
  FROM   stream
  WHERE  post_id = thepost_id
  </code></pre>
  
  <p>However this doesn't seem to work (it returns nothing).</p>
  
  <p>I could use a graph api call for this, but it gives some information I don't need and doesn't have some that I do need. This means I have to use multiple graph api calls which is slower and inefficient. I'd rather get the information using FQL where I can specify the specific things I want, but how do I do it?</p>
  
  <p>Additionally, why can't I make a query using the full post id (authorId_postid)? Why do I have to trim off the authorid?</p>