oracle中区分大小写的重复值

Question

我有一张包含以下示例记录的表格

Name    Profession      University
-----   --------------  ---------------
Ram     Student         xxxUniversity
Ravi    Professor       xyzUniversity
Reshma  Professor       abcUniversity
Ram     StudenT         xxxUniversity

如上所示，“Ram”具有区分大小写的重复记录。我的 Oracle 查询应该返回不同的记录和一条“Ram”记录，它在 Profession 列中具有最大数量的大写字符。

预期结果

    Name    Profession      University
    -----   --------------  ---------------
    Ravi    Professor       xyzUniversity
    Reshma  Professor       abcUniversity
    Ram     StudenT         xxxUniversity

Answer 1

试试这个：

SELECT name,
       Profession,
       university
FROM
(SELECT name,
       Profession,
       university,
       ROW_NUMBER() OVER (PARTITION BY NAME,UPPER(PROFESSION) ORDER BY REGEXP_COUNT (Profession, '[A-Z]') DESC) RN
  FROM table1)
WHERE RN=1;

Answer 2

获取按转换为大写（或小写）的每一列的唯一值划分的行号：

SELECT name, profession, university
FROM   (
  SELECT name, profession, university,
         ROW_NUMBER()
           OVER (
             PARTITION BY
               UPPER( name ),
               UPPER( profession ),
               UPPER( university )
             ORDER BY
               LENGTH( TRANSLATE( profession, ' abcdefghijklmnopqrstuvwxyz', ' ' ) ) DESC
           )
           AS rn
  FROM   your_table
)
WHERE  rn = 1;