mysql查询不适用于哪里条件

Question

我正在mysql中运行以下查询。

SELECT jobtype_has_trade.jobtype_id,users_jobtype.user_id 
FROM users 
    LEFT JOIN subcontractor ON users.subcontractor_id = subcontractor.id 
        AND subcontractor.quotations = "YES" 
    LEFT JOIN users_jobtype ON users.id = users_jobtype.user_id 
        AND users_jobtype.status = "A" 
    LEFT JOIN jobtype_has_trade ON users_jobtype.jobtype_trade_id = jobtype_has_trade.id 
WHERE users.is_subcontractor = "YES" 
AND users.has_android = "YES" 
AND jobtype_has_trade.jobtype_id IN (1,3,4) 
ORDER by users_jobtype.user_id ASC

我正在得到这个输出

在上面的记录中，我只需要具有jobtype_id 1,3和4的user_id。因此，user_id 3和7是可以接受的，而9则不是，因为它只有3和4作为jobtype_id ...在上面的查询中，只有3和7作为user_id？

Answer 1

一种选择是将having clause与group by一起使用

SELECT users_jobtype.user_id 
FROM users 
    LEFT JOIN subcontractor ON users.subcontractor_id = subcontractor.id 
        AND subcontractor.quotations = "YES" 
    LEFT JOIN users_jobtype ON users.id = users_jobtype.user_id 
        AND users_jobtype.status = "A" 
    LEFT JOIN jobtype_has_trade ON users_jobtype.jobtype_trade_id = jobtype_has_trade.id 
WHERE users.is_subcontractor = "YES" 
AND users.has_android = "YES" 
AND jobtype_has_trade.jobtype_id IN (1,3,4)
group by users_jobtype.user_id
having count(distinct jobtype_has_trade.jobtype_id)=3

Answer 2

只需检查每个用户在1,3,4中是否存在jobtype_id。我不知道你的架构 如果您在users_jobtype中有jobtype_id，则无需在子查询中的何处（在我的解决方案中）加入

的jobtype_has_trade

SELECT jobtype_has_trade.jobtype_id,
           users_jobtype.user_id
    FROM users
    LEFT JOIN subcontractor ON users.subcontractor_id = subcontractor.id
    AND subcontractor.quotations = "YES"
    LEFT JOIN users_jobtype ON users.id = users_jobtype.user_id
    AND users_jobtype.status = "A"
    LEFT JOIN jobtype_has_trade ON users_jobtype.jobtype_trade_id = jobtype_has_trade.id
    WHERE users.is_subcontractor = "YES"
      AND users.has_android = "YES"
      AND jobtype_has_trade.jobtype_id IN (1,
                                           3,
                                           4)

       and exists( select jobtype_id from jobtype_has_trade inner join users_jobtype on users_jobtype.jobtype_trade_id=jobtype_has_trade.id where users_jobtype.user_id=users.id and 

        jobtype_has_trade.jobtype_id=1
       ) 
       and exists( select jobtype_id from jobtype_has_trade inner join users_jobtype on users_jobtype.jobtype_trade_id=jobtype_has_trade.id where users_jobtype.user_id=users.id and 

        jobtype_has_trade.jobtype_id=3
       )
       and exists( select jobtype_id from jobtype_has_trade inner join users_jobtype on users_jobtype.jobtype_trade_id=jobtype_has_trade.id where users_jobtype.user_id=users.id and 

        jobtype_has_trade.jobtype_id=4
       )

    ORDER BY users_jobtype.user_id ASC