< DOCTYPE html PUBLIC -WCDTD XHTML StrictEN httpwwwworgTRxhtmlDTDxhtml-strictdtd>
declare @sql as nvarchar(max),@sql1 as nvarchar(max),@sql2 as nvarchar(max),@i as int,@j as int,@l as int,@tmp as nvarchar(max),@stri as nvarchar(5)
set @sql1='';
set @i=0
set @l=3
set @sql2=''
while(@i<@l)
begin
set @stri=cast(@i as nvarchar(5))
set @sql='declare @max'+@stri+' as table(id bigint,parentid int);
insert into @max'+@stri+'(id,parentid)
select max(id),parentid
from Products inner join Classes on Classes.classid=Products.classid
where parentid>0 '
set @j=0
set @tmp=''
while(@j<@i)
begin
set @tmp=@tmp+' and id not in(select id from @max'+cast(@j as nvarchar(5))+')'
set @j=@j+1
end
set @sql=@sql+@tmp+' group by ParentID;'
set @sql1=@sql1+@sql;
if(@i>0) set @sql2=@sql2+' union '
set @sql2=@sql2+'select * from @max'+@stri+' '
set @i=@i+1
end
set @sql=@sql1+
'select ProductName,ProductDpic,1 as indexID,Products.ID,UserName,RealName,Products.Addtime,ParentID from
Products inner join Admin_User on Admin_User.id=Products.userid inner join ('
exec sp_executesql @sql
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本文轉自 netcorner 部落格園部落格，原文連結：http://www.cnblogs.com/netcorner/archive/2011/04/03/2911964.html ，如需轉載請自行聯系原作者