select * from 表名 where to_days(時間欄位名) = to_days(now());
select * from 表名 where to_days(now()) - to_days(時間欄位名) <= 1;
select * from 表名 where date_sub(curdate(), interval 7 day) <= date(時間欄位名);
select * from 表名 where date_sub(curdate(), interval 30 day) <= date(時間欄位名);
select * from 表名 where yearweek(date_format(時間欄位名,'%y-%m-%d')) = yearweek(now());
select * from 表名 where yearweek(date_format(時間欄位名,'%y-%m-%d')) = yearweek(now())-1;
select * from 表名 where date_format(時間欄位名, '%y%m') = date_format( curdate() , '%y%m' );
select * from 表名 where period_diff(date_format(now() , '%y%m' ) ,date_format( 時間欄位名, '%y%m')) =1;
select * from 表名 where date_format(時間欄位名,'%y-%m') = date_format(date_sub(curdate(), interval 1 month),'%y-%m');
select * from 表名 where quarter(時間欄位名) = quarter(now());
select * from 表名 where quarter(時間欄位名) = quarter(date_sub(now(),interval 1 quarter));
select * from 表名 where year(時間欄位名) = year(now());
select * from 表名 where year(時間欄位名) = year(date_sub(now(),interval 1 year));
select * from 表名 where weekofyear(from_unixtime(時間欄位名,'%y-%m-%d')) = weekofyear(now())
select * from 表名 where month(from_unixtime(時間欄位名,'%y-%m-%d')) = month(now());
select * from 表名 where year(from_unixtime(時間欄位名,'%y-%m-%d')) = year(now()) and month(from_unixtime(時間欄位名,'%y-%m-%d')) = month(now()) ;
select * from 表名 where 時間欄位名between 上月最後一天 and 下月第一天;
select date_format(from_unixtime(時間欄位名/1000),'%y%m%d') from 表名;
select unix_timestamp('2018-08-30 19-40-07')
如果引數為空，則處理為當前時間
mysql中使用unix_timestamp和from_unixtime可以不用指定日期型別
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