title: Insert JSON string into Postgres and return field
body: <p>I want to insert a JSON string into a Postgres table with a jsonb field and want the insert query to return a part of the JSON. For example, I want to return the id in the example below. What goes on the question marks?</p>
  
  <pre><code>insert into mytable (myjson)
  values ('{"id":123}') returning ???
  </code></pre>