mysql - 获取查询结果的子集

Question

request 表有外键字段job 和user。我需要提取一个用户同时拥有 job = 35 和 job = 34 的行的子集。

这个查询是否正确地完成了工作？我相信是的。

SELECT * FROM `request` 
WHERE `job` = 35 AND `fulfilled` is NULL 
AND 
`user` IN 
(SELECT `user` FROM `request` WHERE `job` = 34 AND `fulfilled` is NULL )

Answer 1

SELECT user
FROM   request
WHERE  job IN (34,35) AND `fulfilled` is NULL 
GROUP BY user
HAVING COUNT(DISTINCT job) = 2

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