如何在mysql中選擇最近的日期

Question

編輯版本

EMPLOYEE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   | 

職務

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

，我需要選擇員工的教育背景的最新日期信息

結果將是

結果查詢

|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

嘗試這種情況：

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

OR

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

，你會得到想要的結果

Answer 3

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

結果是

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

Answer 4

子查詢將返回爲每一位員工的最大日期，則應加入這個子查詢與表返回整行：

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 5

員工123

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

僱員554

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