title: How to extract unique days between two timestamps in BigQuery?
body: <p>for two different timestamps,  let's say timestamp('2015-02-01') and timestamp ('2015-02-12'), I want a column with all the dates in between. Like this (12 Rows) 
  2015-02-01
  2015-02-02
  .
  . 
  . 
  2015-02-12</p>