title: Get node name in Oracle json table column
body: <p>I have a table in Oracle that has a JSON field, and I would access a key name instead of it's value, because it is variable and there's no way to know it.</p>
  
  <p>For example, you can imagine that the first element in json root is this item, so you have one time <code>$.keyname1</code> and another time <code>$.keyname2</code>.</p>
  
  <p>I would check if the <code>$[0]</code> key name is the first or the second one.</p>