mysql - 选择按年份分组的最大值

Question

考虑到我有下表

WindDirection | WindSpeed | Date
            W |       12  | 17/01/14
          NNW |       20  | 20/02/14
           SE |       15  | 30/04/14
          ENE |       25  | 21/06/15
          NNE |       23  | 10/12/15
          WSW |       8   | 07/01/15
            S |       19  | 05/06/15

如何获得每年的最大值？ 我想实现这个

Year | WindSpeed | WindDirection
2014 |        20 |           NNW
2015 |        25 |           ENE

这是我的查询，它不起作用，只是让你有一个想法

SELECT CONCAT("20", SUBSTRING(`Date`, -2)) AS `Year`, `WindSpeed`, `WindDirection`
FROM `weather`
WHERE `WindSpeed` = (SELECT MAX(`WindSpeed`) 
                     FROM `weather`)
GROUP BY `Year` DESC

提前致谢!

Answer 1

你可以使用下面的查询

SELECT  B.Year ,
    WindSpeed ,
    A.WindDirection
FROM    weather A
    INNER JOIN ( SELECT YEAR ,
                        MAX(WindSpeed) AS WindSpeed
                 FROM   ( SELECT    YEAR(Date) AS YEAR ,
                                    WindSpeed ,
                                    WindDirection
                          FROM      weather
                        ) A
                 GROUP BY YEAR
               ) b ON A.WindSpeed = b.WindSpeed
                      AND B.YEAR = YEAR(A.Date)