select channel_name,from_unixtime(createTime,‘%Y-%m-%d‘) as tdate,count(deviceid) ‘安装量‘,count(case when amt<>0 then 1 end) ‘付费量‘ from v_payitem group by channel_name,tdate
count里可以加条件判断，你们见过吗？
颤抖吧，骚年们，2016年末最牛逼的sql语句
原文：http://www.cnblogs.com/as3lib/p/6200448.html
