MySQL Group By并根据年龄进行分组

Question

MySQL 是否可以根据年龄段处理数据分组？

在我的用户表中，年龄值是他们的实际年龄。我想根据年龄段对它们进行分组。例如：

ages below 1 year old as age1, 1-4 yrs as age2, 5-9 yrs. old as age3 and so on.

Answer 1

是的。您在 CASE 类中进行分区。

SELECT
   COUNT(*),
   CASE
     WHEN age < 1 THEN 'age1'
     WHEN age BETWEEN 1 AND 4 THEN 'age2'
     WHEN age BETWEEN 4 AND 9 THEN 'age3'
     ELSE 'age4'
   END AS ageband
FROM children
GROUP BY ageband;