mysql如何查询当前周的第一天的日期？

转自：http://blog.csdn.net/zzhongcy/article/details/43016685

select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 1 DAY);

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MySQL查询的方式很多，下面为您介绍的MySQL查询实现的是查询本周、上周、本月、上个月份的数据，如果您对MySQL查询方面感兴趣的话，不妨一看。

查询当前今天的数据 
SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) =date_format(now(),'%Y-%m-%d');

查询当前这周的数据 
SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now());

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

############################

默认情况下， 这个 yearweek、WEEK ( 日期 )  是 每把周日，作为一周的开始。

有的是周日开始，有的是周一开始。而工作中有的时候每周是从周六开始算的，有些数据需要按周统计，那么那种方式比较好呢？

 

通过下面的研究，认为yearweek()是适合的，它返回的是 201311这样的格式。若要把周六当做新的一周的开始，那么就是：

 

select yearweek(DATE_ADD(now(), INTERVAL 1 DAY));

 

mysql> select yearweek(DATE_ADD(now(), INTERVAL 1 DAY));

+-------------------------------------------+

| yearweek(DATE_ADD(now(), INTERVAL 1 DAY)) |

+-------------------------------------------+

|                                    201311 |

+-------------------------------------------+

1 row in set

 

mysql> select yearweek(now());

+-----------------+

| yearweek(now()) |

+-----------------+

|          201310 |

+-----------------+

1 row in set

 

mysql> 

select yearweek(now() - INTERVAL 1 DAY)    从周1开始本周计算

select yearweek('2015-02-02 11:12:00' - INTERVAL 1 DAY) 

############################

摘自：http://hideto.javaeye.com/blog/255816

当前week的第一天：
select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 1 DAY)

当前week的最后一天：
select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) – 5 DAY)

前一week的第一天：
select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 8 DAY)

前一week的最后一天：
select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 2 DAY)

前两week的第一天：
select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 15 DAY)

前两week的最后一天：
select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 9 DAY)
当前month的第一天：
SELECT concat(date_format(LAST_DAY(now()),’%Y-%m-’),’01′)

当前month的最后一天：
SELECT LAST_DAY(now())

前一month的第一天：
SELECT concat(date_format(LAST_DAY(now() – interval 1 month),’%Y-%m-’),’01′)

前一month的最后一天：
SELECT LAST_DAY(now() – interval 1 month)

前两month的第一天：
SELECT concat(date_format(LAST_DAY(now() – interval 2 month),’%Y-%m-’),’01′)

前两month的最后一天：
SELECT LAST_DAY(now() – interval 2 month)
当前quarter的第一天：
select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-3 month),’%Y-%m-’),’01′)

当前quarter的最后一天：
select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-1 month)

前一quarter的第一天：
select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-6 month),’%Y-%m-’),’01′)

前一quarter的最后一天：
select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-4 month)

前两quarter的第一天：
select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-9 month),’%Y-%m-’),’01′)

前两quarter的最后一天：
select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-7 month)

UNIX时间戳转换为日期用函数： FROM_UNIXTIME()

1. select FROM_UNIXTIME(1156219870);

日期转换为UNIX时间戳用函数： UNIX_TIMESTAMP()

1. Select UNIX_TIMESTAMP(’2006-11-04 12:23:00′);

########################

今天

select * from 表名 where to_days(时间字段名) = to_days(now());

昨天

SELECT * FROM 表名 WHERE TO_DAYS( NOW( ) ) - TO_DAYS( 时间字段名) <= 1

7天

SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(时间字段名)

近30天

SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 30 DAY) <= date(时间字段名)

本月

SELECT * FROM 表名 WHERE DATE_FORMAT( 时间字段名, '%Y%m' ) = DATE_FORMAT( CURDATE( ) , '%Y%m' )

上一月

SELECT * FROM 表名 WHERE PERIOD_DIFF( date_format( now( ) , '%Y%m' ) , date_format( 时间字段名, '%Y%m' ) ) =1

#查询本季度数据
select * from `ht_invoice_information` where QUARTER(create_date)=QUARTER(now());
#查询上季度数据
select * from `ht_invoice_information` where QUARTER(create_date)=QUARTER(DATE_SUB(now(),interval 1 QUARTER));
#查询本年数据
select * from `ht_invoice_information` where YEAR(create_date)=YEAR(NOW());
#查询上年数据
select * from `ht_invoice_information` where year(create_date)=year(date_sub(now(),interval 1 year));

查询当前这周的数据 
SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now());

查询上周的数据
SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YEARWEEK(now())-1;//国外一周是从周日到周六来算的  SELECT * FROM ordersrecord WHERE         YEARWEEK(ordertime,1) =YEARWEEK(date_sub(curdate(),interval 7 day),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

where   date(regdate)   =   curdate();

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

SELECT date( c_instime ) ,curdate( )
FROM `t_score`
WHERE 1
LIMIT 0 , 30