mysql时间函数

1.获取当前日期+时间

now();
sysdate()；

这两个函数都是获取日期+时间，不同之处在于：now()在执行开始时值就得到了，sysdate()在函数执行时动态得到值

2.获取当前日期：

curdate();
current_date();
current_date;

3.获取当前时间：

curtime();
current_time();
current_time;

4.获取本月

SELECT DATE_FORMAT( CURDATE(), '%Y-%m-01') AS '本月初';
SELECT DATE_FORMAT( LAST_DAY(CURDATE()), '%Y-%m-%d') AS '本月末';

5.一周

DATE_SUB(CURDATE(), INTERVAL 1 WEEK)

6.三月

DATE_SUB(CURDATE(), INTERVAL 3 MONTH)

7.一年

DATE_SUB(CURDATE(), INTERVAL 1 YEAR) 

8.统计用的时间

 -- 今天
    select * from ticket_order_detail where to_days(use_time) = to_days(now());
    -- 7天
    SELECT *FROM ticket_order_detail  where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date( use_time)
    -- 近30天
    SELECT *FROM ticket_order_detail  where DATE_SUB(CURDATE(), INTERVAL 30 DAY) <= date( use_time)
    -- 本月
    SELECT *FROM ticket_order_detail  WHERE DATE_FORMAT(  use_time, '%Y%m' ) = DATE_FORMAT( CURDATE( ) , '%Y%m' )
    -- 上一月
    SELECT *FROM ticket_order_detail  WHERE PERIOD_DIFF( date_format( now( ) , '%Y%m' ) , date_format(  use_time, '%Y%m' ) ) =1
    #查询本季度数据
    select * from `ticket_order_detail` where QUARTER(use_time)=QUARTER(now());
    #查询上季度数据
    select * from `ticket_order_detail` where QUARTER(use_time)=QUARTER(DATE_SUB(now(),interval 1 QUARTER));
      #查询一季度数据
    select * from `ticket_order_detail` where QUARTER(use_time)=QUARTER(DATE_FORMAT(now(),'%Y-01-%d'));
      #查询二季度数据
    select * from `ticket_order_detail` where QUARTER(use_time)=QUARTER(DATE_FORMAT(now(),'%Y-04-%d'));
      #查询三季度数据
    select * from `ticket_order_detail` where QUARTER(use_time)=QUARTER(DATE_FORMAT(now(),'%Y-07-%d'));
      #查询四季度数据
    select * from `ticket_order_detail` where QUARTER(use_time)=QUARTER(DATE_FORMAT(now(),'%Y-10-%d'));
    #查询本年数据
    select * from `ticket_order_detail` where YEAR(use_time)=YEAR(NOW());
    #查询上年数据
    select * from `ticket_order_detail` where year(use_time)=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;
    -- 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`whereDATE_FORMAT(pudate,‘%Y%m‘)=DATE_FORMAT(CURDATE(),‘%Y%m‘) ;
    select * from user where WEEKOFYEAR(FROM_UNIXTIME(pudate,’%y-%m-%d’)) = WEEKOFYEAR(now())
    select*
    fromuser
    whereMONTH(FROM_UNIXTIME(pudate,‘%y-%m-%d‘))=MONTH(now())
    select*
    from[user]
    whereYEAR(FROM_UNIXTIME(pudate,‘%y-%m-%d‘))=YEAR(now())
    andMONTH(FROM_UNIXTIME(pudate,‘%y-%m-%d‘))=MONTH(now())
    select*
    from[user]
    -- wherepudatebetween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