如何根据出生年份将人们分成年龄段 (SQL)

Question

给定 birth_year 和 personal_id，我想创建 var "age"，然后按 personal_id 分组到 2018 年的年龄段（范围）。

我尝试过的：

SELECT personal_id, (2018 - birth_year) AS age
FROM mydatabase
WHERE birth_year is not null
GROUP BY CASE
    WHEN age between 18 and 24 THEN '18-24'
    WHEN age between 25 and 34 THEN '25-34'
    WHEN age between 35 and 44 THEN '35-44'
    WHEN age between 45 and 54 THEN '45-54'
    WHEN age between 55 and 64 THEN '55-64'
    WHEN age > 64 THEN '65+'
    END

我收到一条错误消息，提示 "age" 不是列名。我假设 CASE 语句可能需要嵌套，如下所示：

SELECT personal_id
FROM
(SELECT personal_id, (2018 - birth_year) as age,
CASE
    WHEN age between 18 and 24 THEN '18-24'
    WHEN age between 25 and 34 THEN '25-34'
    WHEN age between 35 and 44 THEN '35-44'
    WHEN age between 45 and 54 THEN '45-54'
    WHEN age between 55 and 64 THEN '55-64'
    WHEN age > 64 THEN '65+'
ELSE 0
END AS age_group
FROM mydatabase
).

这背后的理想是 "age" 先创建 var，然后再对人进行存储。

我希望这已经足够清楚了。谢谢！

Answer 1

使用APPLY:

SELECT agegrp, COUNT(*)
FROM mydatabase d CROSS APPLY
     (VALUES (2018 - birth_year)) v1(age) CROSS APPLY
     (VALUES (CASE WHEN v1.age between 18 and 24 THEN '18-24'
                   WHEN v1.age between 25 and 34 THEN '25-34'
                   WHEN v1.age between 35 and 44 THEN '35-44'
                   WHEN v1.age between 45 and 54 THEN '45-54'
                   WHEN v1.age between 55 and 64 THEN '55-64'
                   WHEN v1.age > 64 THEN '65+'
              END)
     ) v(agegrp)
WHERE birth_year is not null
GROUP BY agegrp;

我将您的查询更改为聚合查询，所以它有意义。

Answer 2

不允许内联别名

SELECT personal_id, CASE
WHEN (2018 - birth_year) between 18 and 24 THEN '18-24'
WHEN (2018 - birth_year) between 25 and 34 THEN '25-34'
WHEN (2018 - birth_year) between 35 and 44 THEN '35-44'
WHEN (2018 - birth_year) between 45 and 54 THEN '45-54'
WHEN (2018 - birth_year) between 55 and 64 THEN '55-64'
WHEN (2018 - birth_year) > 64 THEN '65+' AS age_grop
FROM mydatabase
WHERE birth_year is not null
GROUP BY CASE
    WHEN (2018 - birth_year) between 18 and 24 THEN '18-24'
    WHEN (2018 - birth_year) between 25 and 34 THEN '25-34'
    WHEN (2018 - birth_year) between 35 and 44 THEN '35-44'
    WHEN (2018 - birth_year) between 45 and 54 THEN '45-54'
    WHEN (2018 - birth_year) between 55 and 64 THEN '55-64'
    WHEN (2018 - birth_year) > 64 THEN '65+'
    END,personal_id

如何根据出生年份将人们分成年龄段 (SQL)

How to separate people into age buckets, given birth year (SQL)

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sql-server-2014