create table items
(
itemid varchar(5) not null primary key,
itemname varchar(25) not null,
/* other columns, e.g., unit_price, measurement_unit */
)
create table bom
(
itemid varchar(5) not null references items,
containsid varchar(5) not null references items,
qty int not null
/* other columns, e.g., quantity */
primary key(itemid, containsid),
check (itemid <> containsid)
)
set nocount on
insert into items(itemid, itemname) values('a', 'item a')
insert into items(itemid, itemname) values('b', 'item b')
insert into items(itemid, itemname) values('c', 'item c')
insert into items(itemid, itemname) values('d', 'item d')
insert into items(itemid, itemname) values('e', 'item e')
insert into items(itemid, itemname) values('f', 'item f')
insert into items(itemid, itemname) values('g', 'item g')
insert into items(itemid, itemname) values('h', 'item h')
insert into items(itemid, itemname) values('i', 'item i')
insert into items(itemid, itemname) values('j', 'item j')
insert into items(itemid, itemname) values('k', 'item k')
insert into bom(itemid, containsid, qty) values('e', 'j', 1)
insert into bom(itemid, containsid, qty) values('c', 'e', 3)
insert into bom(itemid, containsid, qty) values('a', 'c', 2)
insert into bom(itemid, containsid, qty) values('h', 'c', 4)
insert into bom(itemid, containsid, qty) values('c', 'b', 2)
insert into bom(itemid, containsid, qty) values('b', 'f', 1)
insert into bom(itemid, containsid, qty) values('b', 'g', 3)
insert into bom(itemid, containsid, qty) values('a', 'b', 2)
insert into bom(itemid, containsid, qty) values('a', 'd', 2)
insert into bom(itemid, containsid, qty) values('h', 'i', 1)
--以下 cte 計算數量的累積乘積：
with bomcte(itemid, containsid, qty, cumulativeqty,level)
as
(
select *, qty ,0
from bom
where itemid = 'a'
union all
select bom.*, bom.qty * bomcte.cumulativeqty, bomcte.level+1
from bom
join bomcte
on bom.itemid = bomcte.containsid
)
select * from bomcte
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