mysql左连接多列

Question

我正在为我的工作构建一个数据库，我无法弄清楚如何构建这个查询。

与我的问题相关的表是：

工作

Surgical_Planning - 作为外键的工作，存在一些工作，不存在其他工作

Medical_Model - 作为外键的工作，与工作的1对1关系

这是一个有效的查询，我没有任何有关手术计划的信息

    SELECT
    job,
    physician_idphysician as Physician,
    patient_idpatient as Patient,
    status,
    DATE_FORMAT(scan_date, '%M %e, %Y, %l:%i%p') as Scan_Date,
    DATE_FORMAT(timestamp, '%M %e, %Y, %l:%i%p') as Recieved,
    DATE_FORMAT(date_required, '%M %e, %Y, %l:%i%p') as Date_Required
    FROM
    job, patient_has_physician as phys, Scan, Medical_Model as med
    WHERE
    Scan.job_job = job AND phys.job_job = job
    AND med.job_job = job AND job.type =  'medical

我想我想做一个左连接，这样它就会按顺序显示每个工作，包含上面查询中的所有信息，但是当有一个工作的Surgical_Planning时，我希望那里有一个列也是如此。 这是我的尝试无效

    SELECT
    job,
    physician_idphysician as Physician,
    patient_idpatient as Patient,
    status,
    DATE_FORMAT(scan_date, '%M %e, %Y, %l:%i%p') as Scan_Date,
    DATE_FORMAT(timestamp, '%M %e, %Y, %l:%i%p') as Recieved,
    DATE_FORMAT(date_required, '%M %e, %Y, %l:%i%p') as Date_Required
    FROM
    job, patient_has_physician as phys, Scan, Medical_Model as med

    LEFT JOIN Surgical_Planning ON job.job = Surgical_Planning.job_job
    AND Scan.job_job = job AND phys.job_job = job
    AND med.job_job = job AND job.type = 'medical'

我可以按照我想要的方式使这个基本的左连接工作，但是如果我想添加更多像上面的列那么它不起作用。

    SELECT job, planning_id
    FROM job
    LEFT JOIN Surgical_Planning ON job = Surgical_Planning.job_job

可以使用子查询吗？ 我可以找出这些更基本的查询，但真的遇到了这些更复杂的连接和子查询问题。 任何建议表示赞赏。

编辑---作业表架构

---

- 表mmrl 。 job

---

DROP TABLE IF EXISTS mmrl 。 job

创建表，如果不存在mmrl 。 job （

job INT（11）NOT NULL AUTO_INCREMENT，

type VARCHAR（45）NULL，

status VARCHAR（45）NULL DEFAULT NULL，

timestamp TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP，

PRIMARY KEY（ job ））

ENGINE = InnoDB

DEFAULT CHARACTER SET = latin1;

Answer 1

更改

LEFT JOIN Surgical_Planning ON job.job = Surgical_Planning.job_job
AND Scan.job_job = job AND phys.job_job = job
AND med.job_job = job AND job.type = 'medical'

至

LEFT JOIN Surgical_Planning ON job.job = Surgical_Planning.job_job
WHERE Scan.job_job = job AND phys.job_job = job
AND med.job_job = job AND job.type = 'medical'

编辑：

左连接发生在实际LEFT JOIN语法左侧的表中。 将作业移至列表的末尾，然后重试。

FROM patient_has_physician as phys, Scan, Medical_Model as med, job