查詢最近七天的資料統計

select count(0) count, date_format(operatetime,'%m-%d') time, 

case dayofweek(operatetime)  when 1 then '星期日' when 2 then '星期一' when 3 then '星期二' when 4 then '星期三' when 5 then '星期四' when 6 then '星期五' when 7 then '星期六' end  week
from rm_ferrydata_log 
where datediff(now(),operatetime)<=6  
group by time
order by time;

優化： null 轉0， 沒有資料，就顯示時間，且數量設為0

select ifnull(b.count,0) count, a.click_date time,

case dayofweek(click_date)  when 1 then '星期日' when 2 then '星期一' when 3 then '星期二' when 4 then '星期三' when 5 then '星期四' when 6 then '星期五' when 7 then '星期六' end  week
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 count(0) count, date(operatetime) time
from rm_ferrydata_log 
where  datediff(now(),operatetime)<=6  
group by time
) bon a.click_date=b.time

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