title: How to index JSON data in PostgreSQL 9.3, when its key is unknown?
body: <p>Does anyone know how to create index on following JSON data in PostgreSQL 9.3?</p>
  
  <p>Example data:</p>
  
  <pre><code>{
    {"1111" : "aaaa"},
    {"2222" : "bbbb"},
    {"3333" : "cccc"}
  }
  </code></pre>
  
  <p>Say if I want to index on all the keys how to do that?</p>
  
  <p>Thanks.</p>