判断当前时间是不是星期天

判断当前时间是不是星期天   

if    datepart(dw, getdate())=1   

      print   'yes'  
    else

      print   'no'

 判断一月内所有星期天

 select DATEADD(wk, DATEDIFF(wk,0, dateadd(dd,6-datepart(day,getdate()),getdate()) ), -1)
union all select DATEADD(wk, DATEDIFF(wk,0, dateadd(dd,6-datepart(day,getdate()),getdate()) ), 6)
union all select DATEADD(wk, DATEDIFF(wk,0, dateadd(dd,6-datepart(day,getdate()),getdate()) ), 13)
union all select DATEADD(wk, DATEDIFF(wk,0, dateadd(dd,6-datepart(day,getdate()),getdate()) ), 20)