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用这个基本的左连接,但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,如果不是存在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