mysql - MySQL将字符串转换为日期计算年龄并按年龄排序

Question

我正在尝试编写一个 mysql 查询，它将字符串转换为日期，然后计算年龄，然后按年龄计算年龄和分组。

我有迄今为止的字符串并计算年龄查询：

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`

但我无法按年龄计算和分组。有人可以帮我吗？

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 演示