过滤一对多关系的多方面

Question

我有两个表：jobs和job_industries（已加入jobs.id=job_industries.job_id ）。 我想找到所有带有jobs.title like '%Finance%'工作， jobs.title like '%Finance%'而没有job_industries.industry=1 。

但是，当在下面运行查询时，我会得到一份符合职称条件且至少具有一个不是1行业选项的工作列表。

select jobs.id, title, industry
from `job_industries`
left join jobs on jobs.id=`job_industries`.job_id
where is_live=1 and jobs.`is_closed`=0 and 1 in (select industry from job_industries where job_id in )

例如，如果一个作业具有两个job_industry关系（ industry=1和industry=2 ），则此作业将与查询匹配。 我希望找到没有的工作。

Answer 1

SELECT j.id, j.title, ji.industry
    FROM jobs j
        INNER JOIN job_industries ji
            ON j.id = ji.job_id
                AND ji.industry <> 1
    WHERE j.title LIKE '%Finance%'
        AND j.is_live = 1
        AND j.is_closed = 0
        AND NOT EXISTS (SELECT 1
                            FROM job_industries ji2
                            WHERE ji2.job_id = j.id
                                AND ji2.industry = 1);

或者，您可以改为执行以下操作：

SELECT j.id, j.title, ji.industry
    FROM jobs j
        INNER JOIN job_industries ji
            ON j.id = ji.job_id
                AND ji.industry <> 1
        LEFT JOIN job_industries ji2
            ON j.id = ji2.job_id
                AND ji2.industry = 1
    WHERE j.title LIKE '%Finance%'
        AND j.is_live = 1
        AND j.is_closed = 0
        AND ji2.job_id IS NULL;

Answer 2

select jobs.id, title, industry
from `job_industries`
left join jobs on jobs.id=`job_industries`.job_id AND job_industries.industry=1
where is_live=1 and jobs.`is_closed`=0 and job_industries.industry IS NULL