SQL对数据进行按月统计或对数据进行按星期统计的实例代码

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 '0'
,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 '1'
,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 '2'
,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 '3'
,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 '4'
,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 '5'
,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 '6'
FROM ims_integral_order

　　2、数据库返回如下：