Oracle分析函数RANK()|ROW_NUMBER()|LAG()使用详解 ROW_NUMBER()函数: row_number()和rownum差不多,功能更强一点(可以在各个分组内从1开时排序),效率更高(?效率貌更差些,实际测验时)。 ROW_NUMBER()的使用方法: ROW_NUMBER() OVER (PARTITION BY C
Oracle分析函数RANK()|ROW_NUMBER()|LAG()使用详解
ROW_NUMBER()函数:
row_number()和rownum差不多,功能更强一点(可以在各个分组内从1开时排序),效率更高(?效率貌似更差些,实际测验时)。
ROW_NUMBER()的使用方法:
ROW_NUMBER() OVER (PARTITION BY COL1 ORDER BY COL2)
详细说明:
根据COL1分组
在分组内部根据 COL2排序
而这个值就表示每组内部排序后的顺序编号(组内连续的唯一的)
ROW_NUMBER()语法如下: 1、row_number() over( order by column desc )先对列 column 按照降序,再为每条记录返回一个序列号: SELECT D.*, ROW_NUMBER() OVER( ORDER BY D.R_OPATE_NUM DESC ) AS INX FROM REPORT_DATA D
ROW_NUMBER()语法如下: 1、row_number() over(order by column desc)先对列column按照降序,再为每条记录返回一个序列号: SELECT D.*, ROW_NUMBER() OVER(ORDER BY D.R_OPATE_NUM DESC) AS INX FROM REPORT_DATA D
[sql] view plaincopyprint?
2、row_number() over(partition by column1 order by column2 asc ) 先按照column1分组,再对分组后的数据进行以column2升序排列 select personalid,ct_smp_type,row_number() over(partition by personalid order by ct_smp_type asc ) rn from neogoodsrule 语法1的具体实例:获取前100名人员的排名信息,如下2、row_number() over(partition by column1 order by column2 asc) 先按照column1分组,再对分组后的数据进行以column2升序排列 select personalid,ct_smp_type,row_number() over(partition by personalid order by ct_smp_type asc) rn from neogoodsrule 语法1的具体实例:获取前100名人员的排名信息,如下
[sql] view plaincopyprint?
WITH REPORT_DATA AS ( SELECT DW.DWID,DW.DWMC,JY.JYXM,JY.JH,RMPC.R_OPATE_NUM FROM REPORT_MONTH_PERSON_COUNT RMPC,JWT_JYXX JY,T_DWXX DW WHERE RMPC.JYID = JY.JYUSERID AND JY.SSDW = DW.DWID AND RMPC.R_YEAR = 2013 AND RMPC.R_MONTH = 6 AND JY.SSDW LIKE '4102%' ORDER BY RMPC.R_OPATE_NUM DESC ) SELECT B.* FROM ( SELECT D.*, ROW_NUMBER() OVER( ORDER BY D.R_OPATE_NUM DESC ) AS INX FROM REPORT_DATA D ) B WHERE B.INX ORDER BY B.INX
[sql] view plaincopyprint?
查看更多关于Oracle分析函数ROW_NUMBER()的详细内容...
声明:本文来自网络,不代表【好得很程序员自学网】立场,转载请注明出处:http://haodehen.cn/did94513