Question

我有一个包含response_id，question_id和answer_id列的表。

我想找到所有匹配多个条件的response_id。例如，以下是一些用例

用户选择问题1的答案1和问题2的答案2
用户（问题1的选择答案3和问题2的答案2）或问题3的答案1

在SQL中，我可以使用INTERSECT和UNION执行此操作，但INTERSECT在MySQL中不可用。有人可以指导我如何解决这个问题吗？

示例，这在MySQL中是必需的。

select distinct(response_id) from table where question_id = 873 AND answer_id = 5269
intersect
select distinct(response_id) from table where question_id = 874 AND answer_id = 5273
intersect
select distinct(response_id) from table where question_id = 877 AND answer_id = 5286

Answer 1

MySQL不支持INTERSECT，但我们可以使用EXISTS子句来模拟它：

SELECT DISTINCT response_id
FROM table
WHERE
    question_id = 873 AND
    answer_id = 5269 AND
    response_id IN (
        SELECT DISTINCT response_id FROM yourTable
        WHERE question_id = 874 AND answer_id = 5273) AND
    response_id IN (
        SELECT DISTINCT response_id FROM yourTable
        WHERE question_id = 877 AND answer_id = 5286);

Answer 2

SELECT DISTINCT * FROM 
(SELECT table.response_id FROM table, data WHERE table.question_id = 873 AND  
table.answer_id = 5269) query1
INNER JOIN
(SELECT table.response_id FROM table, data WHERE table.question_id =874 AND 
table.answer_id = 5273) query2

根据条件交叉表的多行

2 个答案: