在mysql中查询当天数据我们使用到如year,month,day函数是一种做法，还有一种利用date(regdate) = curdate()函数，当然我们也可以用其它方法，下面我来总结一下。

mysql查询当天的所有信息,代码如下:

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,代码如下:

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

另一种写法没测试过,查询当天的记录,代码如下:

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.

查询当前这周的数据,代码如下:

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

查询上周的数据,代码如下:

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

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')

查询距离当前现在6个月的数据,代码如下:

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

查询上个月的数据,代码如下:

1. select name,submittime from enterprise where date_format(submittime,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m')
2. select * from `user` where DATE_FORMAT(pudate,'%Y%m') = DATE_FORMAT(CURDATE(),'%Y%m') ;
3. select * from user where WEEKOFYEAR(FROM_UNIXTIME(pudate,'%y-%m-%d')) = WEEKOFYEAR(now())
4. select * --phpfensi.com
5. from user
6. where MONTH(FROM_UNIXTIME(pudate,'%y-%m-%d')) = MONTH(now())
7. select *
8. from [user]
9. where YEAR(FROM_UNIXTIME(pudate,'%y-%m-%d')) = YEAR(now())
10. and MONTH(FROM_UNIXTIME(pudate,'%y-%m-%d')) = MONTH(now())
11. select *
12. from [user]
13. where pudate between 上月最后一天
14. and 下月第一天

mysql查询多少秒内的数据,代码如下:

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.