mysql查詢今天、昨天、7天、近30天、本月、上一月 數據

獲取當前時間

CURTIME();

查詢今天的數據

select * from table where to_days(time) = to_days(now())

查詢昨天數據

select * from error where to_days(now())-to_days(alarmtime)=1

查詢最近一個星期數據

select * from error where to_days(now())-to_days(alarmtime)<=7

SELECT * FROM error where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(alarmtime)

查詢某天后一個星期的數據

SELECT * FROM error where DATE_ADD('2018-12-13', INTERVAL 7 DAY)

以上查詢語句若有一天沒有數據就沒有那一天的顯示

要想每天都顯示 空的補0 可以用下面的sql 

構建一個最近七天的結果集，然后和查詢的結果集合做left join

select a.click_date,ifnull(b.count1,0)as count1 from (
SELECT curdate() as click_date
union all SELECT date_sub(curdate(), interval 1 day) as click_date
union all SELECT date_sub(curdate(), interval 2 day) as click_date
union all SELECT date_sub(curdate(), interval 3 day) as click_date
union all SELECT date_sub(curdate(), interval 4 day) as click_date
union all SELECT date_sub(curdate(), interval 5 day) as click_date
union all SELECT date_sub(curdate(), interval 6 day) as click_date ) a
left join ( select date(alarmtime) as datetime, count(*) as count1 from error  where type=1 group by date(alarmtime) ) b on a.click_date = b.datetime