用sql语句实现年龄分段统计

SELECT
    CASE
WHEN (age >= 10 AND age <= 20) THEN
    ‘10-20‘
WHEN (age >= 21 AND age <= 30) THEN
    ‘21-30‘
ELSE
    ‘30-‘
END ‘eag_layer‘,
 count(*) emps
FROM
    address_book
GROUP BY
    CASE
WHEN (age >= 10 AND age <= 20) THEN
    ‘10-20‘
WHEN (age >= 21 AND age <= 30) THEN
    ‘21-30‘
ELSE
    ‘30-‘
END
ORDER BY
    1;

SELECT ‘10-20‘ 年龄段, COUNT(*) 人数
FROM [Table]
WHERE [年龄] BETWEEN 10 AND 20
UNION ALL
SELECT ‘21-30‘ 年龄段, COUNT(*) 人数
FROM [Table]
WHERE [年龄] BETWEEN 21 AND 30
UNION ALL
SELECT ‘31‘ 年龄段, COUNT(*) 人数
FROM [Table]
WHERE [年龄] > 30 

select case when [年龄] BETWEEN 10 AND 20  then ‘10-20‘
            when [年龄] BETWEEN 20 AND 30  then ‘20-30‘
            when [年龄] > 30 then ‘30以上‘ end as ‘年龄段‘,
       count(*) as ‘人数‘ FROM [Table] 

先将年龄除10取整

select floor(年龄/10) as age from 表

• 1

再根据年龄整数分组统计

select age ,count(age) from
(
select floor(年龄/10) as age from 表
)
group by age

这样基本效果就出来了，达到楼主的要求就要加如函数计算了

sql语法

select convert(varchar，age*10)+‘--‘+convert(varchar，(age+1)*10) ,count(age) from
(
select floor(年龄/10) as age from 表
)
group by age

oracle语法

select age*10 || ‘--‘|| (age+1)*10 ,count(age) from
(
select floor(年龄/10) as age from 表
)
group by age

用sql语句实现年龄分段统计

原文：https://www.cnblogs.com/telwanggs/p/9248092.html