提取最大計數，然後比較

SELECT c.student_name,COUNT(c.student_name) 
FROM MEMBER c INNER JOIN NOMTABLE d ON c.depart_name=d.depart_name 
WHERE (c.student_role = 'head actor' AND d.section='best head actor') OR (c.student_role = 'supporting actor' AND d.section='best supporting actor') OR 
     (c.student_role = 'head actress' AND d.section='best head actress') OR (c.student_role = 'supporting actress' AND d.section='best supporting actress') 
GROUP BY c.student_name;

這是我的查詢，它會給出學生的姓名和學生姓名出現的次數。我想提取具有最大計數的學生姓名，然後我想將該student_name與Table Student中的student_name進行比較，並提取該計數最多的該學生的student_name和date_of_birth。提取最大計數，然後比較

我知道我可以做的選擇*從（上面的查詢）其中rownum < = 1但之後，我無法比較student_name和學生表中的student_name。

任何幫助，這將是他非常有幫助。非常感謝你。

來源

2014-10-18 user3690321

SELECT s.student_name,s.date_of_birth 
FROM student s 
WHERE s.student_name = (SELECT c.student_name 
         FROM MEMBER c INNER JOIN NOMTABLE d ON c.depart_name=d.depart_name 
         WHERE (c.student_role = 'head actor' AND d.section='best head actor') 
          OR (c.student_role = 'supporting actor' AND d.section='best supporting actor') 
          OR (c.student_role = 'head actress' AND d.section='best head actress')    
          OR (c.student_role = 'supporting actress' AND d.section='best supporting actress') 
         GROUP BY c.student_name 
         HAVING COUNT(c.student_name) = (SELECT COUNT(c.student_name) student_count 
                 FROM MEMBER c INNER JOIN NOMTABLE d ON c.depart_name=d.depart_name 
                 WHERE (c.student_role = 'head actor' AND d.section='best head actor') 
                 OR (c.student_role = 'supporting actor' AND d.section='best supporting actor') 
                 OR (c.student_role = 'head actress' AND d.section='best head actress')    
                 OR (c.student_role = 'supporting actress' AND d.section='best supporting actress') 
                 AND ROWNUM <=1 
                 GROUP BY c.student_name 
                 ORDER BY student_count DESC 
                ));

來源

2014-10-18 21:08:50 Ram

返回一個錯誤，ORA-00935：組函數嵌套太深 – user3690321 2014-10-18 21:18:48

更新代碼現在試試 – Ram 2014-10-18 21:22:51

ORDER BY COUNT（c.student_name）DESC * 錯誤在第17行： ORA-00907：缺少右括號對不起，但現在它說，還有一個錯誤。儘管感謝幫助我。 – user3690321 2014-10-18 21:53:24

我將與子查詢和row_number()處理這一嘗試使用HAVING條款：

SELECT s.*, cnt 
FROM (SELECT c.student_name, COUNT(*) as cnt, 
      ROW_NUMBER() OVER (PARTITION BY c.student_name ORDER BY COUNT(*) DESC) as seqnum 
     FROM MEMBER c INNER JOIN 
      NOMTABLE d 
      ON c.depart_name= d.depart_name 
     WHERE (c.student_role = 'head actor' AND d.section='best head actor') OR 
      (c.student_role = 'supporting actor' AND d.section='best supporting actor') OR 
      (c.student_role = 'head actress' AND d.section='best head actress') OR 
      (c.student_role = 'supporting actress' AND d.section='best supporting actress') 
     GROUP BY c.student_name 
    ) cd JOIN 
    students s 
    on cd.student_name = s.student_name 
WHERE seqnum = 1;

來源

2014-10-18 22:56:40

它在拋出一個錯誤：在第11 GROUP BY c.student_name * ERROR： ORA-00937：不是單組分組函數 – user3690321 2014-10-19 01:51:46

，我想提取DATE_OF_BIRTH和學生表中的student_name。 – user3690321 2014-10-19 01:57:27

@ user3690321。。。我看不出爲什麼甲骨文會產生這樣的錯誤;子查詢本質上是您的查詢重新格式化一個額外的列。如果你只想從學生表中選擇兩列，那麼在外部查詢中添加這些列而不是's。*'。 – 2014-10-19 19:54:32

提取最大計數，然後比較

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