Oracle SQL 缺失年份计算最后的价值和复利

Question

我在 Oracle 中有以下 table：

F1	F2	年	AMT
DC1	123	2021	1000
DC1	123	2022	1100
DC1	123	2023
DC1	123	2024
DC2	456	2021	5000
DC2	456	2022	6000
DC2	456	2023
DC2	456	2024

我想根据最后一个可用日期（ YEAR 2022) 并乘以 AMT 每年复利 2.1%。

我用过LAST_VALUE函数

`(LAST VALUE(AMT IGNORE NULLS) OVER (PARTITION BY F1, F2 ORDER BY F1 F2 YEAR ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING) AS NEXT_AMT`

获取每个分组的最后一个值（1100 和 6000），但是当我乘以 2.1% 时，我没有得到复利效应。

期望的输出：

F1	F2	年	AMT	NEXT_AMT	NEW_AMT
DC1	123	2021	1000		1000
DC1	123	2022	1100		1100
DC1	123	2023		1100	1123.1
DC1	123	2024		1100	1146.68
DC2	456	2021	5000		5000
DC2	456	2022	6000		6000
DC2	456	2023		6000	6126
DC2	456	2024		6000	6254.65

Answer 1

计算比率然后用算术做乘法：

with t as (
      select t.*,
             max(case when year = 2022 then amt end) over (partition by f1, f2) as year_2022,
             (max(case when year = 2022 then amt end) over (partition by f1, f2) /
              max(case when year = 2021 then amt end) over (partition by f1, f2)
             ) as ratio
      from mytable t
     )
select t.*,
       coalesce(amt,
                year_2022 * power(ratio, year - 2022)
               ) as new_amt
from t;

编辑：

糟糕，我看错了问题。您实际上有一个固定的比例来增加金额。那更容易：

with t as (
      select t.*,
             max(case when year = 2022 then amt end) over (partition by f1, f2) as year_2022
      from mytable t
     )
select t.*,
       coalesce(amt,
                year_2022 * power(1.021, year - 2022)
               ) as new_amt
from t;

我也意识到您可能不想硬编码 2022。所以：

with t as (
      select t.*,
             last_value(case when amt is not null then year end ignore nulls) over (partition by f1, f2 order by year) as last_year,
             last_value(amt ignore nulls) over (partition by f1, f2 order by amt) as last_year_amt
      from mytable t
     )
select t.*,
       coalesce(amt,
                last_year_amt * power(1.021, year - last_year)
               ) as new_amt
from t;

Here 是一个 db<>fiddle.

Oracle SQL 缺失年份计算最后的价值和复利

Oracle SQL Missing Years Calculate Last Value and Compound Interest

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oracle

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