MySQL数据篇（五）--SQL对数据进行按月统计，或对数据进行按星期统计

　　对于所有的需求，当你不知道怎么处理的时候，你就先用最简单的方法，或者说的明白一点，用最原始的方法，先实现业务需求再说。　　

一、对提现队列数据表“ims_checkout_task”进行汇总统计，按月汇总统计每个月的提现总额，提现总次数。

　　1、SQL操作如下：

SELECT id
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL 11 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL 10 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL  9 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL  8 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL  7 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL  6 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL  5 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL  4 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL  3 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL  2 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL  1 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
,SUM(case when FROM_UNIXTIME(addTime,'%Y-%m') = date_format(DATE_SUB(curdate(), INTERVAL  0 MONTH),'%Y-%m') AND `status` = 1 then money else 0 end) as ''
FROM ims_checkout_task

　　2、数据库返回如下：

　　3、关键词：case when

//流程控制语句case语法，例如，如果sex字段值为1，则输出男；如果sex值为2，则输出女；否则输出其他
CASE sex
WHEN '' THEN '男'
WHEN '' THEN '女'
ELSE '其他' END
//所以上面的SQL为，如果条件成立，则输出提现金额money字段，否则输出0.

　　时间处理

//对时间戳格式化成 2018-10
FROM_UNIXTIME(addTime,'%Y-%m')
//SQL获取当前时间格式 2019-08 ,根据expr值不同，依次获取前一个月1，前两个月2 ···
DATE_FORMAT(DATE_SUB(CURDATE(), INTERVAL 0 MONTH),'%Y-%m')
// 函数用于以不同的格式显示日期/时间数据。
DATE_FORMAT(date,format)
//函数从日期减去指定的时间间隔。
DATE_SUB(date,INTERVAL expr type)
//函数返回当前的日期。
CURDATE() 

　　例如

SELECT NOW(),CURDATE(),CURTIME()

　　例如

SELECT DAYOFWEEK(NOW()),WEEKDAY(now()),DATE_FORMAT(NOW(),"%w"),NOW()

二、对积分订单数据表按周汇总统计订单量，比如今天是周二，返回周一到周二的每天单量汇总数据，依次类推

　　1、SQL操作如下：

SELECT id
,SUM(case when DATE_FORMAT(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),'%w') = 1 AND WEEK(date_add(curdate(),interval 6 day),2) = WEEK(date_add(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),interval 6 day),2) AND `pay_status` = 1 then 1 else 0 end) as ''
,SUM(case when DATE_FORMAT(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),'%w') = 2 AND WEEK(date_add(curdate(),interval 6 day),2) = WEEK(date_add(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),interval 6 day),2) AND `pay_status` = 1 then 1 else 0 end) as ''
,SUM(case when DATE_FORMAT(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),'%w') = 3 AND WEEK(date_add(curdate(),interval 6 day),2) = WEEK(date_add(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),interval 6 day),2) AND `pay_status` = 1 then 1 else 0 end) as ''
,SUM(case when DATE_FORMAT(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),'%w') = 4 AND WEEK(date_add(curdate(),interval 6 day),2) = WEEK(date_add(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),interval 6 day),2) AND `pay_status` = 1 then 1 else 0 end) as ''
,SUM(case when DATE_FORMAT(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),'%w') = 5 AND WEEK(date_add(curdate(),interval 6 day),2) = WEEK(date_add(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),interval 6 day),2) AND `pay_status` = 1 then 1 else 0 end) as ''
,SUM(case when DATE_FORMAT(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),'%w') = 6 AND WEEK(date_add(curdate(),interval 6 day),2) = WEEK(date_add(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),interval 6 day),2) AND `pay_status` = 1 then 1 else 0 end) as ''
,SUM(case when DATE_FORMAT(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),'%w') = 0 AND WEEK(date_add(curdate(),interval 6 day),2) = WEEK(date_add(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),interval 6 day),2) AND `pay_status` = 1 then 1 else 0 end) as ''
FROM ims_integral_order

　　2、数据库返回如下：

　　3、关键词

//格式化时间戳，返回星期数，注意周日返回值为0
DATE_FORMAT(FROM_UNIXTIME(pay_time,'%Y-%m-%d'),'%w')
//返回当前时间为一年中第几周
WEEK(DATE_ADD(CURDATE(),interval 6 day),2)
//获取指定日期是一年中的第几周
WEEK(date,mode)
//函数向日期添加指定的时间间隔。
DATE_ADD(date,INTERVAL expr type)
//所以上面的查询条件为星期和第几周同时满足