title: Select numbers that are not in a column
body: <p>I have a column of type integer and the records has numbers from 1 to 270 so far. I'd like to write a query that returns numbers that are not in the database between 1 and 270.
  e.g. number 5, 10, 15, 117 are missing. So that query should return these numbers.
  And there are some numbers missing because the count of records is less than 270 and it's unpractical to search it with eye.</p>
  
  <p>thank you</p>