title: Querying an array of arrays in MongoDB
body: <p>Say, I have a document like this..</p>
  
  <pre><code>"ID" : "fruit1",
  "Keys" : [["apple", "carrot", "banana"]]
  </code></pre>
  
  <p>How do I query for Keys = "carrot". None of the following syntax works.</p>
  
  <pre><code>db.myColl.results.find({ "Keys" : "carrot" });
  db.myColl.results.find({ "Keys" : [["carrot"]] });
  </code></pre>
  
  <p>Following works though, but not helpful.</p>
  
  <pre><code>db.myColl.results.find({ "Keys" : [["apple", "carrot", "banana]]});
  </code></pre>
  
  <p>Any pointer to this query will be helpful. Thanks.</p>