我的表格载有累计降雨量数据。 我想计算每张记录的降雨量,并以这一价值更新表格。
下表是:
| ID | date | WsRaincount | Rain |
|---|---|---|---|
| 1 | 2023-07-01 13:01 | 10 | |
| 2 | 2023-07-01 13:05 | 10.2 | |
| 3 | 2023-07-01 13:10 | 10.3 |
结果是:
| ID | date | WsRaincount | Rain |
|---|---|---|---|
| 1 | 2023-07-01 13:01 | 10 | 0 |
| 2 | 2023-07-01 13:05 | 10.2 | .2 |
| 3 | 2023-07-01 13:10 | 10.3 | .1 |
可使用<代码>LAG()功能计算差额:
SELECT
([wsraincount]) - (LAG([wsraincount]) OVER (ORDER BY [id])) AS RainDiff
我的问题是,我现在如何看待<条码>RainDiff的价值,并将其放在适当的雨栏中?
您可以使用一个表率表或计算表(并直接更新,无需重新加入)。
UPDATE WithDiff
SET Rain = RainDiff
FROM (
SELECT *,
wsraincount - LAG(wsraincount) OVER (ORDER BY id) AS RainDiff
FROM yourTable t
) WithDiff;
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