Question

我正在努力制作一个合适的mysql查询。这是表格：

**survey_result**
question_id
header_id
answer

答案是（0,1,2,3,4,5）范围内的int。我想进行一个查询，在那里我将计算特定id的次数，特定的答案。所以对于question_id = 1，我想看看：

question_id answer occurence_number
1           0      12
1           1      20
1           2      34
1           3      5
1           4      9
1           5      15

而且我很可能会选择大多数或最少出现的答案。但那是第二部分，我正在努力争取第一部分。

在第一个声明的巨大帮助下，我设法完成了它，这就是工作版本的样子：

select question_id, max(occurence_number) FROM
(select question_id, answer, count(*) as occurence_number
from survey_result
group by question_id, answer
order by question_id asc, occurence_number desc) as results
GROUP BY question_id

Answer 1

SELECT
  Question_id,
  answer,
  COUNT(answer)
FROM Questions
WHERE question_id = 1
GROUP BY Question_ID, answer;

对于第二部分，要获得最大出现次数的答案：

SELECT
  Question_id,
  answer,
  COUNT(answer)
FROM questions
GROUP BY Question_ID,  
         answer
HAVING COUNT(answer) = (SELECT MAX(TheCount)
                        FROM
                        (
                           SELECT COUNT(answer) AS TheCount
                           FROM questions
                           GROUP BY answer
                        ) AS t) ;

SQL Fiddle Demo

或：简单地说：

SELECT
  Question_id,
  answer,
  COUNT(answer) Occurrance
FROM Questions
WHERE question_id = 1
GROUP BY Question_ID, answer
ORDER BY Occurrance DESC 
LIMIT 1;

但这只会给你一个价值。然而，如果有相同最大出现次数的答案，请使用前一个。

Answer 2

select question_id, answer, count(*) as occurence_number
from survey_result
group by question_id, answer
order by question_id asc, occurence_number desc;

Answer 3

选择 Question_id，回答， COUNT（答案）来自问题 WHERE = 1 GROUP BY（Question_ID，answer）

如何计算表中的多个值出现次数并选择最大值

3 个答案:

SQL Fiddle Demo