谁帮我解释下这个存储过程什么意思啊

ALTER proc [dbo].[up_getFactorsBySid] @sid bigint 
as
select f.*,d.*,k.* from Sys_Factor as f inner join 
Sys_Device as d on f.Fid = d.Fid inner join Sys_Kind
as k on f.Kid = k.Kid
where d.Sid = @sid and d.Dshow <> 0 order by d.Dorder ;

修改存储过程[dbo].[up_getFactorsBySid]
Sys_Factor ，Sys_Device ， Sys_Kind 三表连接查询。

+ 就是一个表的联查