mysql - MySQL中如何任意bin？

Question

我有一个表，其中有一列列出了用户的年龄。我想将年龄分组为任意分组(13-17,18-25 等)，然后能够按这些分组进行分组并对每个组中的用户进行计数。如何在查询中完成此操作？

Answer 1

SELECT CASE WHEN age BETWEEN 13 AND 17 THEN '13-17' 
            WHEN age BETWEEN 18 AND 25 THEN '18-25' 
            ELSE '26+' END AS AgeGroup,
    COUNT(*) AS total
FROM MyTable
GROUP BY AgeGroup