Question

编辑版本

员工表

|ID | employee_id |   Name             |   
| 1 | 123         | John Richard       | 
| 2 | 554         | Daniel Domingo     |

教育背景

|ID | employee_id | School/institute   | date graduated |
| 1 | 123         | highschool         | 2007           |
| 2 | 123         | college            | 2011           |
| 3 | 554         | college            | 2010           |
| 4 | 554         | masteral           | 2013           |

职称

|ID | employee_id | Job description    |
| 1 | 123         | Free lancer        |
| 2 | 554         | admin assistant    |

我需要选择员工教育背景的最新日期信息

结果将是

结果查询

|ID | employee_id | Name               | Job title       | year_graduated | school_institute |
| 1 | 123         | John Richard       | Free Lancer     |    2011        | college          |
| 2 | 554         | Daniel Domingo     | Admin Assistant |    2013        | masteral         |

Answer 1

试试这个：

SELECT * 
FROM (SELECT * FROM tableA ORDER BY employee_id, date_graduated DESC) A 
GROUP BY employee_id

或

SELECT a.* FROM tableA a INNER JOIN (SELECT employee_id, MAX(date_graduated) maxDate FROM tableA GROUP BY employee_id ) b ON a.employee_id = b.employee_id AND a.date_graduated = b.maxDate

Answer 2

SELECT employee_id ,MAX([date graduated]) FROM Table GROUP BY [employee_id]

结果是

employee_id | date graduated
----------------------------
        123 | 2011 
        554 | 2013

Answer 3

子查询将返回每个员工的最大日期，然后您应该将此子查询与您的表一起返回完整行：

SELECT yourtable.*
FROM
  yourtable INNER JOIN (SELECT employee_id, MAX(`date graduated`) max_date
                        FROM yourtable
                        GROUP BY employee_id) m
  ON yourtable.employee_id = m.employee_id
     AND yourtable.`date graduated` = m.max_date

Answer 4

员工123的

SELECT * FROM `your_table` 
WHERE employee_id=123 
ORDER BY date_graduated DESC LIMIT 1

员工554的

SELECT * FROM `your_table` 
WHERE employee_id=554
ORDER BY date_graduated DESC LIMIT 1

Answer 5

SELECT *
FROM t
GROUP BY employee_id
HAVING date_graduated=max(date graduated)

并且您将获得所需的结果

如何在mysql中选择最近的日期

5 个答案: