小编use*_*655的帖子

我正在尝试编写此查询以检索按日期分组的记录数:

SELECT system_date,count (is_paid)
  FROM TPWEB.TP_CLIENT_TENDER_TRANS
  where system_date between '1-DEC-12' and '31-DEC-12'
  group by system_date

但是,我得到的结果没有分组如:

01-DEC-12   1
01-DEC-12   1
01-DEC-12   1
01-DEC-12   1

怎么了...