Laravel上使用：

$list = Article::where('status',2)->where('category_id',$category_id)

->select(DB::raw('id, type,thumb_img,title,tags,intro,video_id,external_link

,live_start_time,live_end_time,live_id,page_views,zan_num,published_at,collection_num, case when collection_num=0 then timestampdiff(second,now(),live_start_time) else timestampdiff(second,live_start_time,now()) end as sort_time'))

->orderBy('collection_num','asc')

->orderBy('sort_time','asc')

->paginate($per_page);

原生MySQL语句：

SELECT id, type,thumb_img,title,tags,intro,video_id,external_link,live_start_time,live_end_time,live_id,page_views,zan_num,published_at,status , case when status =0 then timestampdiff(second,now(),live_start_time) else timestampdiff(second,live_start_time,now()) end as sort_time FROM `articles` WHERE category_id=4 ORDER BY status asc,sort_time asc;

返回部分值

返回年、季度、月、日、时、分、秒、年月日、时分秒

SELECT create_time -- 时间,YEAR(create_time)-- 返回年,QUARTER(create_time)-- 返回季度, MONTH(create_time)-- 返回月, DAY(create_time)-- 返回日, HOUR(create_time)-- 返回小时, MINUTE(create_time)-- 返回分钟, SECOND(create_time)-- 返回秒, DATE(create_time)-- 返回年月日, TIME(create_time)-- 返回时分秒FROMtime_function;

跟周有关的函数

SELECTcreate_time,week(create_time)-- 返回所在周数(本年遇到的第一个星期天作为第一周，前面的计算为第0周),week(create_time,1)-- 返回所在周数(第一周超过3天，那么计算为本年的第一周),weekofyear(create_time)-- 返回所在周数,yearweek(create_time)-- 返回年份和周数,weekday(create_time)-- 返回工作日索引值(0代表周一),dayofweek(create_time)-- 返回工作日索引值(1代表周日)FROMtime_function;

所属第几天

SELECTcreate_time,dayofmonth(create_time)-- 返回月份的第几天,dayofyear(create_time)-- 返回年份的第几天FROMtime_function;

返回英文名​​​​​​​

SELECTcreate_time,dayname(create_time)-- 返回工作日英文名,monthname(create_time)-- 返回月份英文名FROMtime_function;

返回特定的格式​​​​​​​

SELECTcreate_time,date_format(create_time,'%Y-%m-%d %H:%i:%s')-- 返回年月日时分秒,date_format(create_time,'%w')-- 返回所在工作日索引值(0代表周日),time_format(create_time,'%H:%i')-- 返回时分FROMtime_function;

当前时间和日期​​​​​​​

SELECTcurrent_date()-- 当前日期,current_time-- 当前时间,now()-- 当前时间和日期,localtime()-- 当前时间和日期

时间和日期的计算

时间和日期的加减

固定时间类型的加减

函数说明

addtime()、subtime()时间的加减

adddate()、subdate()天数的加减

period_add()月份的加减

SELECTcreate_time,addtime(create_time,'1:00:00') as add1hour-- 增加一小时,subtime(create_time,'1:00:00') as reduce1hour-- 减少一小时,adddate(create_time,1) as add1day-- 增加一天,subdate(create_time,1) as reduce1day-- 减少一天,period_add(date_format(create_time,'%Y%m'),1) as add1month-- 增加一个月,period_add(date_format(create_time,'%Y%m'),-1) as reduce1month-- 减少一个月from time_function

自定义时间类型的加减

函数说明

timestampadd(type,int_expr,datetime)type：year,quarter,month,day,hour,minute,second

int_expr:所要加减的数值

datetime:所要处理的时间

date_add(datetime,interval int_expr type)

date_sub(datetime,interval int_expr type)

SELECTcreate_time,TIMESTAMPADD(day,1,create_time) as add1day-- 增加一天,TIMESTAMPADD(day,-1,create_time) as reduce1day-- 减少一天,date_add(create_time,interval 1 hour) as add1hour_1-- 增加一小时,date_add(create_time,interval -1 hour) as reduce1hour_1-- 减少一小时,date_sub(create_time,interval -1 hour) as add1hour_2-- 增加一小时,date_sub(create_time,interval 1 hour) as reduce1hour_2-- 减少一小时FROMtime_function;

返回两个时间格式之间的差值

返回固定类型的时间差

函数说明备注

timediff(datetime1,datetime2)返回两者相差的时间其结果被限制在-838:59:59到838:59:59

datediff(datetime1,datetime2)返回两者之间相差的天数无

period_diff(P1,P2)返回两者之间相差的月份格式均为YYYYMM或者YYMM

SELECTcreate_time,timediff('2019-03-01 16:00:00',create_time) as date_diff-- 返回两者之间相差的时间,now()-- 当前时间,datediff(now(),create_time) as date_diff-- 返回两者之间相差的天数,date_format(now(),'%Y%m')-- 当前月份,period_diff(date_format(now(),'%Y%m'),date_format(create_time,'%Y%m')) as month_diff-- 返回两者之间的月份差值FROMtime_function;

返回自定义类型的时间差

TIMESTAMPDIFF(type,datetime1,datetime2)​​​​​​​

SELECT create_time,now(),timestampdiff(month,create_time,now()) as month_diff-- 返回两者之间的月份差值,timestampdiff(day,create_time,now()) as day_diff-- 返回两者之间的天数差值FROMtime_function;

来源：https://www.icode9.com/content-2-849751.html