【在线等】MS-SQL 根据实际所需规格table去比对另一个库存table取浪费最少的数据
本帖最后由 comcyd 于 2013-10-19 08:26:49 编辑
情境描述：根据表A里的物料去比对表B,然后表A根据A1括号里两个尺寸浪费最少来将A1替换成最省的物料。
表A用量需求表：Table A
A0(自增长ID) A1(物料编号)
-------------------------------
0 ls001-(900*110)
1 ls002-(200*300)
....
表B库存物料表: B1没有重复，可以当作ID来使用 Table B:
B1(库存物料) B2(规格1) B3（规格2）
----------------------------------------------
ls001-(700*200) 700 200
ls001-(910*140) 910 140
ls001-(920*120) 920 120
... ... ...
ls002-(100*200) 100 200
ls002-(200*350) 200 350
ls002-(220*320) 220 320
...
原理是：ls001取(920*120)的话浪费分别是左边920-900=20，右边120-110=10，总共浪费是30， 是ls001库存规格(700*200)，(910*140)，(920*120)里浪费最少的，ls002同理。
最后A1字段被替换后的效果如下：
A0(自增长ID) A1(物料编号)
-------------------------------
0 ls001-(920*120)
1 ls002-(220*320)
...
各位有什么好的方案或者算法可分享来学习借鉴一下 ^_^ 算法 SQL
[解决办法]
WITH ta (a0,a1) AS
(
SELECT 0,'ls001-(900*110)' UNION ALL
SELECT 1,'ls002-(200*300)'
)
,tb (B1,B2,B3) AS
(
SELECT 'ls001-(700*200)',700,200 UNION ALL
SELECT 'ls001-(910*140)',910,140 UNION ALL
SELECT 'ls001-(920*120)',920,120 UNION ALL
SELECT 'ls002-(100*200)',100,200 UNION ALL
SELECT 'ls002-(200*350)',200,350 UNION ALL
SELECT 'ls002-(220*320)',220,320
)
,a AS
(
SELECT a0,
SUBSTRING(a1,1,CHARINDEX('-',a1)-1) a9,
SUBSTRING(a1,CHARINDEX('-',a1)+2,CHARINDEX('*',a1)-CHARINDEX('-',a1)-2) a2,
SUBSTRING(a1,CHARINDEX('*',a1)+1,LEN(a1)-CHARINDEX('*',a1)-1) a3
FROM ta
)
,b AS
(
SELECT SUBSTRING(b1,1,CHARINDEX('-',b1)-1) b9,*
FROM tb
)
SELECT a0,a9+'-('+RTRIM(d1.b2)+'*'+RTRIM(d1.b3)+')'
FROM a
CROSS APPLY
(
SELECT TOP 1 b.b2,b.b3--(b.b2-a.a2)+(b.b3-a.a3) a4
FROM b
WHERE b9=a.a9 AND (b.b2-a.a2)>0 AND (b.b3-a.a3)>0
ORDER BY (b.b2-a.a2)+(b.b3-a.a3)
) d1
WITH ta (a0,a1,a2,a3) AS
(
SELECT 0,'ls001-(900*110)',900,110 UNION ALL
SELECT 1,'ls002-(200*300)',200,300
)
,tb (B1,B2,B3) AS
(
SELECT 'ls001-(700*200)',700,200 UNION ALL
SELECT 'ls001-(910*140)',910,140 UNION ALL
SELECT 'ls001-(920*120)',920,120 UNION ALL
SELECT 'ls002-(100*200)',100,200 UNION ALL
SELECT 'ls002-(200*350)',200,350 UNION ALL
SELECT 'ls002-(220*320)',220,320
)
,a AS
(
SELECT SUBSTRING(a1,1,CHARINDEX('-',a1)-1) a9,*
FROM ta
)
,b AS
(
SELECT SUBSTRING(b1,1,CHARINDEX('-',b1)-1) b9,*
FROM tb
)
SELECT a0,a9+'-('+RTRIM(d1.b2)+'*'+RTRIM(d1.b3)+')'
FROM a
CROSS APPLY
(
SELECT TOP 1 b.b2,b.b3--(b.b2-a.a2)+(b.b3-a.a3) a4
FROM b
WHERE b9=a.a9 AND (b.b2-a.a2)>0 AND (b.b3-a.a3)>0
ORDER BY (b.b2-a.a2)+(b.b3-a.a3)
) d1
drop table a
drop table b
create table a (a0 int,a1 varchar(100),a2 int,a3 int)
insert into a
SELECT 0,'ls001-(900*110)',900,110 UNION ALL
SELECT 1,'ls002-(200*300)',200,300
create table b (B1 varchar(100),B2 int,B3 int)
insert into b
SELECT 'ls001-(700*200)',700,200 UNION ALL
SELECT 'ls001-(910*140)',910,140 UNION ALL
SELECT 'ls001-(920*120)',920,120 UNION ALL
SELECT 'ls002-(100*200)',100,200 UNION ALL
SELECT 'ls002-(200*350)',200,350 UNION ALL
SELECT 'ls002-(220*320)',220,320
;with t
as
(
select a0,a1,
substring(a1,1,charindex('-',a1)-1) as b1,
a2,a3
--substring(a1,charindex('(',a1)+1, charindex('*',a1)-charindex('(',a1)-1) as b2,
--substring(a1,charindex('*',a1)+1, charindex(')',a1)-charindex('*',a1)-1) as b3
from a
),
tt
as
(
select t.a0,
t.a1,
b.b1,
row_number() over(partition by t.a1
order by abs(t.a2-b.b2) + abs(t.a3 - b.b3)) as rownum
from b
inner join t
on b.b1 like t.b1 + '%'
)
select a0,b1 as a1
from tt
where rownum = 1
/*
a0a1
0ls001-(920*120)
1ls002-(220*320)
*/
