Question

我遇到的问题与计算一个字段的值有关，但在前一行使用了值。在带有数据的表RATE

中

ID Original Rate      Capital
-- ------------------ -------
 1 50                       1
 2 50 + 1                   1
 3 50 + 1 + 1               1
 4 50 + 1 + 1 + 2           2
 5 50 + 1 + 1 + 2 + 2       2

公式为：原始汇率（n）=原始汇率（n-1）+资本

在原版中，我有1行，原始费率是50，我希望下一个值应该是原始费率+资本。

我也尝试使用Lag Function，但似乎没有应用于计算字段。

如果你们对这个案子有任何疑问，请帮助我吗？

感谢您的时间！

更新新案例

+----+---------------+------+---------+-------+-------+-------+
| ID | Original Rate | Type | Capital | Rate1 | Rate2 | Rate3 |
+----+---------------+------+---------+-------+-------+-------+ 
|  1 |            50 |    1 |       2 | 0.1   |       |       | 
|  2 |            50 |    1 |       2 | 0.1   |       |       |
|  3 |            50 |    1 |       2 | 0.1   |       |       |
|  4 |            50 |    2 |       1 |       | 0.2   |       |
|  5 |            50 |    3 |       5 |       |       | 0.3   |
+----+---------------+------+---------+-------+-------+-------+

New Rate (n) = New Rate (n-1) + Original Rate * IF(Type=1,Rate1*capital,IF(Type=2,Rate2*capital),Rate3*capital)

我期望的输出在最后一栏如下：

+----+---------------+------+---------+-------+-------+-------+-----+
| ID | Original Rate | Type | Capital | Rate1 | Rate2 | Rate3 |     |
+----+---------------+------+---------+-------+-------+-------+-----+
|  1 |            50 |    1 |       2 | 0.1   |       |       |  10 |
|  2 |            50 |    1 |       2 | 0.1   |       |       |  20 |
|  3 |            50 |    1 |       2 | 0.1   |       |       |  30 |
|  4 |            50 |    2 |       4 |       | 0.2   |       |  70 |
|  5 |            50 |    3 |       5 |       |       | 0.3   | 145 |
+----+---------------+------+---------+-------+-------+-------+-----+

欢迎任何意见和建议！

[2017年4月17日更新] 我使用 Recursion with recursive WITH

实现了提取

WITH RATE_MASTER AS (ID, RATE)
(
    SELECT 1, ORIGINALRATE FROM RATE WHERE ID = 1

    UNION ALL

    SELECT ID,
    CASE 
        WHEN TYPE = 1 THEN RATE + Rate1*Capital 
        WHEN TYPE = 2 THEN RATE + Rate2*Capital
        WHEN TYPE = 3 THEN RATE + Rate3*Capital
    END AS RATE

    FROM RATE, RATE_MASTER
    WHERE RATE_MASTER.ID = RATE.ID - 1
)
SELECT * FROM RATE_MASTER;

它运作正常！

[关闭]

Answer 1

Oracle安装程序：

CREATE TABLE rate ( id, capital ) AS
  SELECT 1, 1 FROM DUAL UNION ALL
  SELECT 2, 1 FROM DUAL UNION ALL
  SELECT 3, 1 FROM DUAL UNION ALL
  SELECT 4, 2 FROM DUAL UNION ALL
  SELECT 5, 2 FROM DUAL;

<强>查询：

SELECT id,
       50 + SUM( capital ) OVER ( ORDER BY id )
          - FIRST_VALUE( capital ) OVER ( ORDER BY id ) AS rate,
       capital
FROM   rate;

<强>输出：

ID RATE CAPITAL
-- ---- -------
 1   50       1
 2   51       1
 3   52       1
 4   54       2
 5   56       2

使用先前值

1 个答案: