袁来如此的工作笔记
袁来如此的工作笔记
竹杖芒鞋轻胜马,谁怕? 一蓑烟雨任平生。

MySQL 查询时间段内的数据

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-- 今天

select fullName,addedTime from t_user where to_days(addedTime) <= to_days(now()); 
-- 昨天

select fullName,addedTime from t_user where to_days(NOW()) - TO_DAYS(addedTime) <= 1; 
-- 近7天

select fullName,addedTime from t_user where date_sub(CURDATE(),INTERVAL 7 DAY) <= DATE(addedTime);
-- 近30天 

SELECT fullName,addedTime FROM t_user where DATE_SUB(CURDATE(), INTERVAL 30 DAY) <= date(addedTime);
-- 本月

SELECT fullName,addedTime FROM t_user WHERE DATE_FORMAT( addedTime, '%Y%m' ) = DATE_FORMAT( CURDATE() , '%Y%m' );
-- 上一月

SELECT fullName,addedTime FROM t_user WHERE PERIOD_DIFF( date_format( now( ) , '%Y%m' ) , date_format( addedTime, '%Y%m' ) ) =1; 
-- 查询本季度数据

select fullName,addedTime FROM t_user where QUARTER(addedTime)=QUARTER(now()); 
-- 查询上季度数据

select fullName,addedTime FROM t_user where QUARTER(addedTime)=QUARTER(DATE_SUB(now(),interval 1 QUARTER)); 
-- 查询本年数据

select fullName,addedTime FROM t_user where YEAR(addedTime)=YEAR(NOW()); 
-- 查询上年数据

select fullName,addedTime FROM t_user where year(addedTime)=year(date_sub(now(),interval 1 year)); 
-- 查询距离当前现在6个月的数据

select fullName,addedTime FROM t_user where addedTime between date_sub(now(),interval 6 month) and now(); 
-- 查询当前这周的数据

SELECT fullName,addedTime FROM t_user WHERE YEARWEEK(date_format(addedTime,'%Y-%m-%d')) = YEARWEEK(now()); 
-- 查询上周的数据

SELECT fullName,addedTime FROM t_user WHERE YEARWEEK(date_format(addedTime,'%Y-%m-%d')) = YEARWEEK(now())-1; 
-- 查询上个月的数据

select fullName,addedTime FROM t_user where date_format(addedTime,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m'); 
-- 查询当前月份的数据

select fullName,addedTime FROM t_user where DATE_FORMAT(addedTime,'%Y%m') = DATE_FORMAT(CURDATE(),'%Y%m');
select fullName,addedTime FROM t_user where date_format(addedTime,'%Y-%m')=date_format(now(),'%Y-%m'); 
-- 查询指定时间段的数据

select fullName,addedTime FROM t_user where addedTime between '2017-1-1 00:00:00' and '2018-1-1 00:00:00'; 
select fullName,addedTime FROM t_user where addedTime >='2017-1-1 00:00:00' and addedTime < '2018-1-1 00:00:00';
 归纳一下:

 1、查询时间段内的数据,一般可以用between and 或 <> 来指定时间段。

 2、mysql的时间字段类型有:datetime,timestamp,date,time,year。

 3、 获取系统当前时间的函数:

select CURDATE();
select NOW();
4、获取时间差的函数:

period_diff()    datediff(date1,date2)      timediff(time1,time2)
5、日期加减函数:

date_sub() 

date_add()     adddate()      addtime()

period_add(P,N)  
6、时间格式转化函数:

date_format(date, format) ,MySQL日期格式化函数date_format()
unix_timestamp() 
str_to_date(str, format) 
from_unixtime(unix_timestamp, format) ,MySQL时间戳格式化函数from_unixtime
顺带写一下oracle的查询语句:
select * from Oracle.alarmLog where alarmtime between to_date('2007-03-03 18:00:00','yyyy-mm-dd hh24:mi:ss') and to_date('2007-09-04 18:00:00','yyyy-mm-dd hh24:mi:ss')

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