使用每个表的 LATEST RECORD 从 INNER JOIN 3 表中获取值

Question

我在从某些表格中获取价值时遇到问题。你可以看到下面的图片，我想得到我用红色阻挡的行。

我试试下面的代码

SELECT p.id, 
       p.email, 
       p.name, 
       p.lastname, 
       p.gender, 
       ex.startwork, 
       ex.endwork, 
       e.degree, 
       e.majority, 
       j.division 
FROM   job_jobseeker AS p 
       INNER JOIN job_experience AS ex 
               ON p.email = (SELECT ex.email 
                             FROM   job_experience 
                             ORDER  BY ex.id DESC 
                             LIMIT  1) 
       INNER JOIN job_education AS e 
               ON p.email = (SELECT e.email 
                             FROM   job_education 
                             ORDER  BY ex.id DESC 
                             LIMIT  1) 
       INNER JOIN job_applying AS j 
               ON p.email = (SELECT j.email 
                             FROM   job_applying 
                             ORDER  BY ex.id DESC 
                             LIMIT  1) 

Answer 1

你需要correlated sub-queries。

为所有三个表中的每个email 查找最新的id

SELECT startwork, 
       endwork, 
       email 
FROM   job_experience a 
WHERE  a.id = (SELECT Max(b.id) 
               FROM   job_experience b 
               WHERE  a.email = b.email) 

上述查询将在job_experience 表中找到每封电子邮件的最新ID。对其他两个表也这样做，然后将结果与job_jobseeker 表连接以获得结果。

SELECT p.id, 
       p.email, 
       p.name, 
       p.lastname, 
       p.gender, 
       ex.startwork, 
       ex.endwork, 
       e.degree, 
       e.majority, 
       j.division 
FROM   job_jobseeker AS p 
       INNER JOIN (SELECT startwork, 
                          endwork, 
                          email 
                   FROM   job_experience a 
                   WHERE  a.id = (SELECT Max(b.id) FROM job_experience b 
                                  WHERE  a.email = b.email)) AS ex 
               ON p.email = ex.email 
       INNER JOIN (SELECT email,  //Just called column without initialize
                          degree, 
                          majority 
                   FROM   job_education a 
                   WHERE  a.id = (SELECT Max(b.id) FROM job_education b 
                                  WHERE  a.email = b.email)) AS e 
               ON p.email = e.email 
       INNER JOIN (SELECT email, //Just called column without initialize
                          division 
                   FROM   job_applying a 
                   WHERE  a.id = (SELECT Max(b.id) FROM job_applying b 
                                  WHERE  a.email = b.email)) AS j 
               ON p.email = j.email