sql - 如何在SQL中的单元格内生成两个数字之间的数字范围

Question

我有一个表，其中一列duration包含整数值，我正在尝试使用 sql 查询构建另一列，该列将包含一个介于 1 和duration列中的值之间的整数列表。

例如：

duration | range
3        | [1, 2, 3]
3        | [1, 2, 3]
2        | [1, 2]
1        | [1]
...

我在 JS 中找到了一个潜在的解决方案。

create or replace function list_range(DURATION double)
  returns VARCHAR
  language javascript
  strict
  as 'return [...Array(DURATION).keys()];';

SELECT 
   t.*,
   list_range(t.duration) as range
FROM table t

你觉得这个解决方案怎么样？可以优化吗？

Answer 1

with temp as (
    select distinct duration, level as l
    from duration
    connect by level <= duration)
select duration,
       '['||listagg(l, ', ') within group(order by l)||']' as range
from temp
group by duration
order by 1 desc;