sql 查詢統計資料，獲取7天內資料

1.查詢最近7天的資料

select * from t_record  

where date_sub(curdate(), interval 7 day) <= date(createdtime)
order by createdtime desc

select date_format(createdtime,'%y-%m-%d') as data, 

count(1) as count 
from t_record 
where createdtime >= date(now()) - interval 7 day 
group by day(createdtime);

3.統計最近7天每天資料數量，沒有資料則利用ifnull 補0

select a.date ,ifnull(b.count,0) as count

from(
select curdate() as date
union all
select date_sub(curdate(),interval 1 day)as date
union all
select date_sub(curdate(),interval 2 day)as date
union all
select date_sub(curdate(),interval 3 day)as date
union all
select date_sub(curdate(),interval 4 day)as date
union all
select date_sub(curdate(),interval 5 day)as date
union all
select date_sub(curdate(),interval 6 day)as date
)a left join(
select date_format(createdtime,'%y-%m-%d') as date, 
count(1) as count 
from t_record 
where createdtime >= date(now()) - interval 7 day 
group by day(createdtime)
)b on a.date = b.date
order by a.date desc

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