title: How can I get all keys from a JSON column in Postgres?
body: <p>If I have a table with a column named <code>json_stuff</code>, and I have two rows with</p>
  
  <p><code>{ "things": "stuff" }</code> and <code>{ "more_things": "more_stuff" }</code></p>
  
  <p>in their <code>json_stuff</code> column, what query can I make across the table to receive <code>[ things, more_things ]</code> as a result?</p>