获取查询结果的子集

Question

表格request包含外键字段job和user。我需要提取行的子集，其中一个用户同时拥有job = 35和job = 34的行。

此查询是否正确完成了工作？我相信它是。

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

• SQLFiddle Demo