Mysql出生日期转换为年龄并分组统计人数的方法示例

查询数据库

SELECT * FROM `student`

查询结果

转换为年龄的查询语句，使用函数TIMESTAMPDIFF

SELECT id, name, birthday, TIMESTAMPDIFF(YEAR,student.birthday,CURDATE()) as age FROM `student`

查询结果

然后按照年龄段进行分组

SELECT
GROUP_CONCAT(a.id) as ids,
GROUP_CONCAT(a.name) as names,
CASE
WHEN a.age<18 THEN '少年'
WHEN a.age>=18 AND a.age< 40 THEN '青年'
WHEN a.age>=40 AND a.age< 60 THEN '中年'
END as age,
count(a.id) as count
FROM
(SELECT id, name, birthday, TIMESTAMPDIFF(YEAR,student.birthday,CURDATE()) as age FROM `student`) as a
GROUP BY
CASE
WHEN a.age<18 THEN '少年'
WHEN a.age>=18 AND a.age< 40 THEN '青年'
WHEN a.age>=40 AND a.age< 60 THEN '中年'
END

查询结果

tips：当前时间是2020年

来源：https://blog.csdn.net/weixin_45121502/article/details/109486301