乙個關於累加工資的T SQL語句

今天在itpub看到乙個人問的語句問題:

問題如下:

table:emp

parent_id emp_id emp_name total_amout

null 2 andrew 200

2 1 nancy 100

2 3 janet 120

3 4 michael 80

1 5 robert 50

每個員工的總銷售額=自己的銷售額+其下級員工的總銷售額，

比如：

andrew = 200_100_120_80_50=550

nancy = 100+50=150

janet = 120+80=200

michael = 80

robert = 50

這個用sql怎樣可以查詢得到，請教一下大家???

我用遞迴+游標實現了一下，總感覺應該有更好的實現方式，下面是我的實現方式:

with recur(parent_id , emp_id , emp_name , total_amout,tlevel) as

(select parent_id , emp_id , emp_name , total_amout,0 as tlevel

from emp as b

where parent_id is null

union all

select a.parent_id , a.emp_id , a.emp_name , a.total_amout,b.tlevel+1

from emp as a inner join recur b on a.parent_id=b.emp_id )

select * into emp_ext

from recur

declare @level int

declare @temp int

select @level=max(tlevel) from emp_ext

while(@level>0)

begin

declare cursor_t cursor local static read_only forward_only

for

select emp_id from emp_ext where tlevel=@level-1

open cursor_t

fetch next from cursor_t into @temp

while @@fetch_status=0

begin

print @level

update emp_ext set total_amout=(select sum(total_amout) from emp_ext where parent_id=@temp)+(select total_amout from emp_ext where emp_id=@temp)

where emp_id=@temp

fetch next from cursor_t into @temp

endset @level=@level-1

close cursor_t

deallocate cursor_t

end為了便於大家測試，我把生成表和資料的**也複製如下:

create table emp(

parent_id int,

emp_id int,

emp_name varchar(50),

total_amout int )