MySql 之 查询

工作中经常 遇到时间类的查询，比如上个月，这个星期，签到之类的，因此写下来有备无患

1查询这一个周的内容

SELECT * FROM ecs_admin_sign_record WHERE YEARWEEK(date_format(add_time,'%Y-%m-%d')) = YEARWEEK('2017-09-01');

查询上周的数据

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

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

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

2 基础函数

ifnull(field, '');