title: Azure Digital Twin forbbitten words in Query
body: <p>When I execute query</p>
  <pre><code>SELECT Group FROM DIGITALTWINS Sensor JOIN Group RELATED Sensor.contains WHERE Sensor.$dtId='xxx’
  </code></pre>
  <p>I'm getting error</p>
  <pre><code>RestError: SQL query parse failed: SQL Parser Error, Line=1, Position=7, Message=mismatched input 'Group' expecting {AVG, CONTAINS, COUNT, DEVICES_JOBS, DEVICES_MODULES, DEVICES, DIGITALTWINS, RELATIONSHIPS, JOIN, MAX, MIN, RELATED, SUM, TOP, EXACT, DEFAULT, '*', IDENTIFIER}
  SQL Parser Error, Line=1, Position=13, Message=mismatched input 'FROM' expecting BY See samples in http://aka.ms/adtv2query for the correct syntax.
  </code></pre>
  <p>But when I change “Group” to another word, ex “a” Query succeeded.
  I'm getting this same error when I use the word “Order”.
  I think this is because this word is used in normal SQL queries, and even if digital twins don't support it, still want to parse it and I got an error.</p>
  <p>Where I can find a list of the forbidden words for queries?</p>