从两个表中计数匹配记录

Question

我有两个表。 “question_answers”有列question和answer。 “question_attempts”具有questionid和responsesummary。

例如：question = 4有5条记录来自“question_answers”。在“question_attempts” 同questionid查找和获取的匹配记录的次数计数“question_attempts”

“question_answers” “question_attempts”

Answer 1

这将是容易得多，如果我能有一个样本这里这些表的，但试试这个

SELECT 
    answers.id AS 'answer id', 
    count(attempts.id) AS 'number of attempts'  
FROM 
    question_attempts AS attempts 
JOIN 
    question_answers AS answers ON answers.answer = attempts.responsessummary 
WHERE 
    question_answers.question = 1 
GROUP BY 
    answers.id; 

，如果它工作正常，你应该得到的答案ID的表，尝试对这个问题的答案的数目。

但是您需要在这两个字段中完全匹配。从question_attempts和question_answers的responsessummary回答问题。

，如果它不可能解决方法是使用LIKE条款：

SELECT 
    answers.id AS 'answer id', 
    count(attempts.id) AS 'number of attempts'  
FROM 
    question_attempts AS attempts 
JOIN 
    question_answers AS answers ON answers.answer 
     LIKE CONCAT('%', attempts.responsessummary , '%') 
WHERE 
    question_answers.question = 1 
GROUP BY 
    answers.id;