这个存储过程错在哪，谢谢
CREATE   PROCEDURE   AdgroupArtDeleteUid
(@uid   int,@tagid   varchar(18))
  AS
begin
declare   @con   varchar(512)
declare   @sql   varchar(1024)

if(@uid=0)
begin
if(@tagid= ' ')
set   @con   =   ' '
else
set   @con   =   'where   tagid   like   %, '+@tagid   + ',% '
end

else
begin
if(@tagid= ' ')
set   @con   =   'where   uid= '+str(@uid)
else
set   @con   =   'where   uid= '+str(@uid)+ '   and   tagid   like   %, '+@tagid+ ',% '
end

set   @sql   =   'delete   t_adgroupart   '+@con
end
exec   (@sql)
GO


------解决方案--------------------
like ' '%, '+@tagid+ ',% ' ' '