Question

我有以下数据，我需要使用T-SQL查询基于组ID计算LCM（最低计算乘积）值。您的帮助将不胜感激。

Groupid GroupValue
------------------
1        2
1        4
1        6
2        5
2        5
2       10
3        3
3       12
3        6
3        9

预期结果如下。

Groupid   GroupLCM
------------------
   1        12
   2        10
   3        36

Answer 1

一种可能的方法是使用如下所示的计数表

See working demo

; with detailedSet as 
(
    select 
        Groupid,
        GroupValue=abs(GroupValue),
        biggest=max(GroupValue) over (partition by Groupid),
        totalNumbers= count(1) over (partition by Groupid)
    from num
    )
,   
possibleLCMValues as 
(
    select Groupid, counter
    from detailedSet b
    cross apply 
    (
select counter= row_number() over ( order by (select null))  * biggest 
from sys.objects o1 cross join sys.objects o2
)c
where c.counter%GroupValue =0
group by Groupid, counter
having count(1)=max(totalNumbers)
)
,
LCMValues as
(
    select 
        Groupid,
        LCM=min(counter) 
    from possibleLCMValues
    group by Groupid
)

select * from LCMValues

如何使用SQL Server计算LCM值？

1 个答案: