Leif160519的blog

1.获取昨天8点到12点的数据：

select * from sensor_info where hour(record_date)>=8 and hour(record_date)<=12 and d_type = 'wenshi' and TO_DAYS(now())-TO_DAYS(record_date)<=1 and TO_DAYS(now())-TO_DAYS(record_date)>0;

2.获取上周历史记录

SELECT d_value FROM sensor_info WHERE YEARWEEK(date_format(record_date,'%Y-%m-%d'))= YEARWEEK(now())-1 and d_type =  ‘wenshi’

3.mysql查询当天的所有信息：

select * from test where year(regdate)=year(now()) and month(regdate)=month(now()) and day(regdate)=day(now())

这个有一些繁琐，还有简单的写法：

select * from table where date(regdate) = curdate();

4.查询当天的记录

select * from hb_article_view where TO_DAYS(hb_AddTime) = TO_DAYS(NOW())

date()函数获取日期部分, 扔掉时间部分，然后与当前日期比较即可

补充：本周、上周、本月、上个月份的数据

5.查询当前这周的数据

SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now());

6.查询上周的数据

SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now())-1;

7.查询当前月份的数据

select name,submittime from enterprise where date_format(submittime,'%Y-%m')=date_format(now(),'%Y-%m')

8.查询距离当前现在6个月的数据

select name,submittime from enterprise where submittime between date_sub(now(),interval 6 month) and now();

9.查询上个月的数据

select name,submittime from enterprise where date_format(submittime,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m')

select * from `user` where DATE_FORMAT(pudate,'%Y%m') = DATE_FORMAT(CURDATE(),'%Y%m') ;

select * from user where WEEKOFYEAR(FROM_UNIXTIME(pudate,'%y-%m-%d')) = WEEKOFYEAR(now())

select * from user where MONTH(FROM_UNIXTIME(pudate,'%y-%m-%d')) = MONTH(now())

select * from [user] where YEAR(FROM_UNIXTIME(pudate,'%y-%m-%d')) = YEAR(now()) and MONTH(FROM_UNIXTIME(pudate,'%y-%m-%d')) = MONTH(now())

select * from [user] where pudate between 上月最后一天 and 下月第一天

10.mysql查询多少秒内的数据

SELECT count( * ) AS c, sum( if( logusertype =2, logusertype, 0 ) ) /2 AS a, sum( if( logusertype =3, logusertype, 0 ) ) /3 AS b 
FROM testlog WHERE UNIX_TIMESTAMP(NOW())-UNIX_TIMESTAMP( logendtime )<=30

查询30秒内记录的总数，loguser等于2的记录的总数和，和 loguser等于3的记录的总数.

if( logusertype =2, logusertype, 0 ) 如果logusetype等于2 就在logusertype上累加，否则加0。

sum( if( logusertype =2, logusertype, 0 ) ) 把logusertype都累加起来。

sum( if( logusertype =2, logusertype, 0 ) ) /2 AS a, 除以2是统计个数。

UNIX_TIMESTAMP(NOW())计算当前时间的秒数，

UNIX_TIMESTAMP( logendtime )计算logendtime的秒数