标签：des style blog color sp on 数据 div 2014
自己做的一个小项目里需要用mysql计算一些信息。
mysql中的 表如下（注：表中数据都是测试数据，随机生成的）
mysql> select * from shake_log; +-----+-------------+--------+---------------------+------+ | id | mobile | credit | time | type | +-----+-------------+--------+---------------------+------+ | 1 | 15963097349 | 1.3 | 2014-12-06 21:00:02 | 2 | | 2 | 18353367706 | 0.3 | 2014-12-06 21:00:05 | 2 | | 3 | 18369902586 | 0.3 | 2014-12-06 21:00:08 | 2 | | 4 | 18369905573 | 0.2 | 2014-12-06 21:00:10 | 2 | | 5 | 18369905170 | 0.5 | 2014-12-06 21:00:13 | 2 | 。。。。。。 。。。。。。 | 125 | 18369905226 | 0.5 | 2014-12-07 05:00:00 | 1 | | 126 | 18369905226 | 0.2 | 2014-12-07 05:00:02 | 0 | | 127 | 18369905226 | 0.2 | 2014-12-07 05:00:04 | 0 | | 128 | 18369905226 | 0.3 | 2014-12-07 05:00:08 | 0 | 。。。。。。 。。。。。。
这张表的含义是这样的，每一条记录代表一次获益，而每个mobile的获益就是当天所有的记录的累加和。
例如上面的记录18369905226有三条记录，那么他今天的获益就是 0.5+0.2+0.2+0.3 = 1.2
1. 求获益最多的mobile和值
select mobile, sum(credit) as sumCredit from shake_log where time between ‘2014-12-06 00:00:00‘ and ‘2014-12-06 23:59:59‘ group by mobile order by sumCredit desc limit 1;
2. 求某一具体的mobile按总获益算得的名次
select rank from (select @counter:=@counter+1 as rank, mobile, sumCredit from (select mobile, sum(credit) as sumCredit from shake_log where time between ‘2014-12-06 00:00:00‘ and ‘2014-12-06 23:59:59‘ group by mobile order by sumCredit desc) as sumList, (select @counter:=0) as t) as rankList where mobile=‘18369905136‘;
标签：des style blog color sp on 数据 div 2014
原文地址：http://www.cnblogs.com/tanhehe/p/4149183.html
