title: In bigquery, is there a way to set data fields to nullable through browser interface
body: <p>In bigquery, is there a way to set data fields to nullable through browser interface?</p>
  
  <p>If not, and I have a mix of integers and NULL values in a column, will the bigquery accept type 'integer' for that field or will it require 'string'?</p>
  
  <p>Thanks</p>