根据日期从分区表中选择数据。如果自动指定日期，则应从正确的表中选择该日期范围的数据

I have partitioned tables based on timestamp. That is data for a month is kept separately in a table. Eg: impression_201501,impression_201502 corresponds to data of 2015 jan and 2015 feb respectively. I have a requirement of pulling exceptions on a biweekly basis automatically.I have partitioned tables based on timestamp. T