PCB MS SQL 排序应用---相邻数据且相同合并处理

这是一个很有趣SQL数据处理应用,具体需求如下

ERP需要工程将物料编码相邻的编码合并求和BOM用量,巧妙的用到了已有排序号与分组排序号之间的差值求解

示例：

原数据：

要求转换：

实际转换后数据：

SQL代码实现:

with tab1 as
(
select 1 as [Rank] ,1710 as OPERATION_CODE,3.621000 UNIT_TIME
UNION  
select 2 as [Rank] ,1710 as OPERATION_CODE,3.621000 UNIT_TIME
UNION 
select 3  as [Rank] ,1711 as OPERATION_CODE,3.333000 UNIT_TIME
UNION 
select 4 as [Rank] ,1710 as OPERATION_CODE,0.288000 UNIT_TIME
UNION 
select 5 as [Rank] ,1711 as OPERATION_CODE,0.288000 UNIT_TIME
UNION 
select 6 as [Rank] ,1711 as OPERATION_CODE,3.333000 UNIT_TIME
)
SELECT * into #tab1 FROM tab1

SELECT * FROM #tab1

SELECT MAX([Rank]) [Rank],OPERATION_CODE,SUM(UNIT_TIME) UNIT_TIME
FROM 
  (SELECT OPERATION_CODE,[Rank],UNIT_TIME,row_number()over(partition by OPERATION_CODE order by [Rank]) -[Rank] DiffVal 
  FROM #tab1) a
GROUP BY OPERATION_CODE,DiffVal
ORDER BY MAX([Rank])