sql server两个时间段内，求出周末的量

　　公司有个表记录了出差（加班）的初始时间和截止时间，现在要计算出加班时间，之前的设计并没有考虑到这部分，因此本人通过sql重新计算周末数

表formmain

starttime

endtime

使用游标方式抓每行的数据进行分析，具体程序如下：

CREATE PROCEDURE [dbo].[shish] 
AS 
declare @starttime datetime
declare @endtime datetime
declare @id decimal(20,0)
declare mycursor cursor for select id,field0007,field0008 from formmain_0896;
open mycursor
fetch next from mycursor into @id,@starttime,@endtime
while(@@fetch_status = 0)
begin
declare @week varchar(20)
declare @num int
set @num = 0
while @starttime <= @endtime
begin
set @week = DATENAME(weekday, @starttime);
if (@week = '星期六' or @week = '星期日')
begin
set @NUM=@NUM+1
end
set @starttime = @starttime + 1;
end
INSERT INTO tbs_sl (id,starttime,endtime,sl) select @id,@starttime,@endtime,@num
fetch next from mycursor into @id,@starttime,@endtime
end
close mycursor
deallocate mycursor
GO