MySQL转换字符串到日期计算年龄和顺序BY年龄

Question

我想写一个mysql查询，将字符串转换为日期，然后计算一个年龄，然后按年龄计算年龄和组。

我有字符串日期和计算年龄查询：

SELECT YEAR(CURRENT_TIMESTAMP) - YEAR(STR_TO_DATE(birthday, '%m/%d/%Y')) - (RIGHT(CURRENT_TIMESTAMP, 5) < RIGHT(STR_TO_DATE(birthday, '%m/%d/%Y'), 5)) as age 
    FROM `persons` 

但我不能指望年龄和组。任何人都可以帮我吗？

Answer 1

SELECT EXTRACT(YEAR FROM (FROM_DAYS(DATEDIFF(NOW(),STR_TO_DATE(birthday, '%m/%d/%Y'))))) + 0 age, 
     COUNT(*) TotalCount 
FROM tableNAme 
GROUP BY EXTRACT(YEAR FROM (FROM_DAYS(DATEDIFF(NOW(),STR_TO_DATE(birthday, '%m/%d/%Y'))))) + 0 
ORDER BY TotalCount DESC 

• SQLFiddle Demo