提取最大计数，然后比较

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;

这是我的查询，它会给出学生的姓名和学生姓名出现的次数。我想提取具有最大计数的学生姓名，然后我想将该student_name与Table Student中的student_name进行比较，并提取该计数最多的该学生的student_name和date_of_birth。提取最大计数，然后比较

我知道我可以做的选择*从（上面的查询）其中rownum < = 1但之后，我无法比较student_name和学生表中的student_name。

任何帮助，这将是他非常有帮助。非常感谢你。

来源

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 
                ));

来源

2014-10-18 21:08:50 Ram

返回一个错误，ORA-00935：组函数嵌套太深 – user3690321 2014-10-18 21:18:48

更新代码现在试试 – Ram 2014-10-18 21:22:51

ORDER BY COUNT（c.student_name）DESC * 错误在第17行： ORA-00907：缺少右括号对不起，但现在它说，还有一个错误。尽管感谢帮助我。 – user3690321 2014-10-18 21:53:24

我将与子查询和row_number()处理这一尝试使用HAVING条款：

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;

来源

2014-10-18 22:56:40

它在抛出一个错误：在第11 GROUP BY c.student_name * ERROR： ORA-00937：不是单组分组函数 – user3690321 2014-10-19 01:51:46

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

@ user3690321。。。我看不出为什么甲骨文会产生这样的错误;子查询本质上是您的查询重新格式化一个额外的列。如果你只想从学生表中选择两列，那么在外部查询中添加这些列而不是's。*'。 – 2014-10-19 19:54:32

提取最大计数，然后比较

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