PCB MS SQL 排序应用---SQL相邻数据区间值求解

Posted 2020-12-02 pcbren

其中一篇 博文中有写《PCB MS SQL 排序应用---相邻数据且相同合并处理》此篇有也应相用也同的技巧，实现相邻数据区间值求解

示例：

原数据：处理前

求出区间值：处理后

 SQL 代码实现

DECLARE @table table(RowNo INT,FlowTechName VARCHAR(20))

INSERT INTO @table(RowNo,FlowTechName) VALUES(1,\'沉铜\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(4,\'钻孔\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(5,\'钻孔\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(6,\'钻孔\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(7,\'沉铜\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(10,\'沉铜\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(11,\'沉铜\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(15,\'钻孔\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(18,\'沉铜\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(20,\'钻孔\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(21,\'钻孔\')
INSERT INTO @table(RowNo,FlowTechName) VALUES(22,\'钻孔\')
 
SELECT * FROM @table

SELECT min(RowNo) minRank,MAX(RowNo) maxRank,FlowTechName
FROM 
  (SELECT FlowTechName,RowNo,row_number()over(partition by FlowTechName order by RowNo) -RowNo DiffVal 
  FROM @table) t
GROUP BY FlowTechName,DiffVal
ORDER BY MAX(RowNo)