按特定顺序获取行号 - PLSQL答案

【问题标题】：Getting the row number in specific order - PLSQL按特定顺序获取行号 - PLSQL
【发布时间】：2022-11-29 01:18:31
【问题描述】：

使用以下查询时获得以下输出

SELECT Tmp.*
      ,DENSE_RANK () OVER (ORDER BY Grp) Rn
FROM (
    SELECT T.*, Id - ROW_NUMBER () OVER (PARTITION BY Recordnum, Imgname ORDER BY Id) Grp
    FROM Testtabledetails T) Tmp
ORDER BY 1, 2;

但预期的输出是（当 RECORDNUM 更改时，RN 应重置为 1 并根据 IMGNAME 递增）

使用以下 SQL 进行数据设置

CREATE TABLE TestTableDetails (
 Recordnum NUMBER
 ,Imgname VARCHAR2 (64)
 ,Fileext VARCHAR2 (8)
);

INSERT ALL 
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042726800, '5000433', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042726800, '5000433', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042726800, '5000436', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042726800, '5000436', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042726800, '5000438', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042726800, '5000438', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042727000, '5000439', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042727000, '5000440', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042727200, '5000441', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042727200, '5000442', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042727200, '5000442', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042727201, '5000443', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042727201, '5000443', '.SBT')
INTO TestTableDetails (Recordnum, Imgname, Fileext) VALUES (
10042727201, '5000444', '.SBT')
SELECT * FROM DUAL;

COMMIT;

请协助我

【问题讨论】：

标签： oracle plsql row-number rownum

【解决方案1】：

我认为您在所需的输出中犯了一个错误，其中 rn 不会在 recordnum 从 *200 更改为 *201 时重置。

除此之外，它只是：

SELECT T.*,
       DENSE_RANK () OVER (PARTITION BY Recordnum ORDER BY Imgname) Rn
FROM Testtabledetails T
ORDER BY 1, 2;

【讨论】：