SQL 循环30日

with Date as (
select 
    cast(DATEADD(mm, DATEDIFF(mm,0,getdate()), 0)  as datetime) 
    Date union all select Date+1 
from Date 
where Date+1 < CONVERT(CHAR(10),DATEADD(m,1,DATEADD(dd,-DAY(GETDATE())+1,GETDATE())),111)
) 
select day(a.Date) as day,
    b.ID,
from Date a  
left join (
select * from Table) b on 
    year(a.Date) = year(b.DATE) 
and month(a.Date) = month(b.DATE) 
and day(a.Date) = day(b.DATE);