Question

我有一个包含四列的表（id，Creditor，Debit，Balance）我想工作

-----------------------------
| id |Creditor|Debit|Balance|
----------------------------
| 1  | 100    |null | null  |
| 2  | 50     |null | null  |
| 3  | null   | 100 | null  |
| 4  | 50     |null | null  |
| 5  | null   | 20  | null  |
| 6  | null   | 10  | null  |
| 7  | null   | 100 | null  |
| 8  | 200    |null | null  |
-----------------------------

债权人 - 借记+上一行余额

我怎样才能实现这个目标

预期产出

 -----------------------------
| id |Creditor|Debit|Balance|
----------------------------
| 1  | 100    |null | 100   |
| 2  | 50     |null | 150   |
| 3  | null   | 100 | 50    |
| 4  | 50     |null | 100   |
| 5  | null   | 20  | 80    |
| 6  | null   | 10  | 70    |
| 7  | null   | 100 | -30   |
| 8  | 200    |null | 170   |
-----------------------------

Answer 1

您可以使用累积总和：

select (coalesce(sum(creditor) over (order by id), 0) +
        coalesce(sum(debitor) over (order by id), 0)
       ) as balance

要设置该值，您可以使用可更新的CTE：

with toupdate as (
      select t.*
             (coalesce(sum(creditor) over (order by id), 0) +
              coalesce(sum(debitor) over (order by id), 0)
             ) as new_balance
      from t
     )
update toupdate
    set balance = new_balance;

债权人 - 借方+上一行余额

1 个答案: