select now();
select now(), sleep(3), now();
select SYSDATE(), sleep(3), SYSDATE();
select current_timestamp, current_timestamp();
select YEARWEEK(now());#201820
select date_format('2018-05-22 10:31:57', '%Y/%m/%d %H:%i:%s');#2018/05/22 10:31:57
#查询本周的数据
SELECT * FROM collie_activiti.act_ru_task art WHERE YEARWEEK(date_format(art.CREATE_TIME_,'%Y-%m-%d')) = YEARWEEK(now());
#查询上周的数据
SELECT * FROM collie_activiti.act_ru_task art WHERE YEARWEEK(date_format(art.CREATE_TIME_,'%Y-%m-%d')) = YEARWEEK(now())-1;
#查询当前月份的数据
select * from collie_activiti.act_ru_task art where date_format(art.CREATE_TIME_,'%Y-%m')=date_format(now(),'%Y-%m')
#查询距离当前现在6个月的数据
select * from collie_activiti.act_ru_task art where art.CREATE_TIME_ between date_sub(now(),interval 6 month) and now();
#查询上个月的数据
select * from collie_activiti.act_ru_task art where date_format(art.CREATE_TIME_,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m')
#查询本周的数据
select FROM_UNIXTIME(app.create_time/1000,'%y-%m-%d') from collie.application app where WEEKOFYEAR(FROM_UNIXTIME(app.create_time/1000,'%y-%m-%d')) = WEEKOFYEAR(now())
#查询当前月份的数据
select FROM_UNIXTIME(app.create_time/1000,'%y-%m-%d') from collie.application app where MONTH(FROM_UNIXTIME(app.create_time/1000,'%y-%m-%d')) = MONTH(now())
#查询当前年份的数据
select FROM_UNIXTIME(app.create_time/1000,'%y-%m-%d') from collie.application app where YEAR(FROM_UNIXTIME(app.create_time/1000,'%y-%m-%d')) = YEAR(now())
#查询任意时间区间内的数据
select FROM_UNIXTIME(app.create_time/1000,'%y-%m-%d') from collie.application app
where app.create_time between UNIX_TIMESTAMP('2017-5-20')*1000 and UNIX_TIMESTAMP('2018-5-22')*1000;