During this period of time, the assigned task is to test the homepage data of the operation background, and count some data information in certain time periods.
Ready to work:
1. Get the current time:
select now()Results: 2019-10-12 17:00:48
2. Timestamp conversion:
1. Convert the year, month, day, hour, minute, and second to a timestamp:
UNIX_TIMESTAMP(NOW())2. Convert the timestamp to year, month, day, hour, minute and second:
FROM_UNIXTIME(时间戳)
例如：FROM_UNIXTIME(1539238971)3. Get the time before the current time, the previous few months, and the previous year
1. n days before
DATE_FORMAT(DATE_SUB(CURDATE(), INTERVAL n DAY), '%Y-%m-%d 00:00:00')
等价于
DATE_SUB(CURDATE(), INTERVAL n DAY) 默认的时间格式就是 %Y-%m-%d 00:00:00 下面类似2. The first n weeks:
DATE_SUB(CURDATE(), INTERVAL n WEEK)3. The first n months
DATE_SUB(CURDATE(), INTERVAL n MONTH)4. The first n years
DATE_SUB(CURDATE(), INTERVAL n YEAR)In summary: DATE_SUB (date, time interval, time interval type) can be flexibly replaced as follows:
4. Statistics on a daily basis
SELECT FROM_UNIXTIME(create_time,'%Y-%m-%d') as time , count(*) as count FROM 表名 where 条件 GROUP BY time
因为我的时间是linux时间戳，所以FROM_UNIXTIME（）去转换Attach my test code:
select DATE_FORMAT(FROM_UNIXTIME(soc.pay_time), '%Y-%m-%d') Day,count(*),sum(soc.paid_money)from so_order as so
left join so_order_charge as soc on so.charge_id = soc.id where so.status != 0 and so.order_type in (0, 1, 2, 3, 6) and so.shop_id != 0
and soc.pay_time between UNIX_TIMESTAMP(DATE_FORMAT(DATE_SUB(CURDATE(), INTERVAL 7 DAY), '%Y-%m-%d 00:00:00')) and UNIX_TIMESTAMP(DATE_FORMAT(DATE_SUB(CURDATE(), INTERVAL 0 DAY), '%Y-%m-%d 00:00:00'))
GROUP BY Day ORDER BY so.create_time desc