SQL 时间函数及花式时间查询

-- 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'

-- 查询某个月的数据(查询17年10月份数据)
select * from exam   where date_format(starttime,'%Y-%m')='2017-10'

--N天内记录:
select * from exam WHERE TO_DAYS(NOW())-TO_DAYS(时间字段)<=N