有条件地执行滞后的 MAX 和 MIN 计算 - Oracle SQL

Question

我有一个 table 的数据是这样的：

|   Order   | Step | StepStart |  StepEnd  | ProcessCode |
|:---------:|:----:|:---------:|:---------:|:-----------:|
| 103502090 | 6900 |  2-Jan-19 |  2-Jan-19 |    START    |
| 103502090 | 6900 |  1/2/2019 |  1/2/2019 |     END     |
| 103502090 | 6950 |  2-Jan-19 |  2-Jan-19 |    START    |
| 103502090 | 6950 |  2-Jan-19 |  2-Jan-19 |     END     |
| 103502090 | 7000 |  3-Jan-19 |  3-Jan-19 |    START    |
| 103502090 | 7000 |  3-Jan-19 |  3-Jan-19 |     END     |
| 103502090 | 7050 |  4-Jan-19 |  4-Jan-19 |    START    |
| 103502090 | 7050 |  4-Jan-19 |  4-Jan-19 |     END     |
| 103502090 | 7100 |  8-Jan-19 |  8-Jan-19 |    START    |
| 103502090 | 7100 |  8-Jan-19 |  8-Jan-19 |     END     |
| 103502090 | 7200 |  9-Jan-19 |  9-Jan-19 |    START    |
| 103502090 | 7200 |  9-Jan-19 |  9-Jan-19 |     END     |
| 103502090 | 7300 |  9-Jan-19 |  9-Jan-19 |    START    |
| 103502090 | 7300 |  9-Jan-19 |  9-Jan-19 |     END     |
| 103502090 | 7400 |  9-Jan-19 |  9-Jan-19 |    START    |
| 103502090 | 7400 |  9-Jan-19 |  9-Jan-19 |   PROCESS   |
| 103502090 | 7400 |  9-Jan-19 |  9-Jan-19 |    START    |
| 103502090 | 7400 |  9-Jan-19 |  9-Jan-19 |     END     |
| 103502090 | 7450 | 10-Jan-19 | 10-Jan-19 |    START    |
| 103502090 | 7450 | 10-Jan-19 | 10-Jan-19 |   PROCESS   |
| 103502090 | 7450 | 10-Jan-19 | 14-Jan-19 |    START    |
| 103502090 | 7450 | 10-Jan-19 | 14-Jan-19 |   PROCESS   |
| 103502090 | 7450 | 10-Jan-19 | 14-Jan-19 |    START    |
| 103502090 | 7450 | 10-Jan-19 | 14-Jan-19 |     END     |
| 103502090 | 7550 | 14-Jan-19 | 14-Jan-19 |    START    |
| 103502090 | 7550 | 14-Jan-19 | 14-Jan-19 |     END     |
| 103502090 | 7700 | 16-Jan-19 | 16-Jan-19 |    START    |
| 103502090 | 7700 | 16-Jan-19 | 16-Jan-19 |     END     |
| 103502090 | 7750 | 17-Jan-19 | 17-Jan-19 |    START    |
| 103502090 | 7750 | 17-Jan-19 | 17-Jan-19 |     END     |
| 103561375 | 7450 |  4-Jan-19 |  4-Jan-19 |    START    |
| 103561375 | 7450 |  4-Jan-19 |  4-Jan-19 |   PROCESS   |
| 103561375 | 7450 |  4-Jan-19 |  8-Jan-19 |    START    |
| 103561375 | 7450 |  4-Jan-19 |  8-Jan-19 |   PROCESS   |
| 103561375 | 7450 |  4-Jan-19 |  8-Jan-19 |    START    |
| 103561375 | 7450 |  4-Jan-19 |  8-Jan-19 |     END     |
| 103561375 | 7550 |  8-Jan-19 |  8-Jan-19 |    START    |
| 103561375 | 7550 |  8-Jan-19 |  8-Jan-19 |     END     |
| 103561375 | 7700 |  9-Jan-19 |  9-Jan-19 |    START    |
| 103561375 | 7700 |  9-Jan-19 |  9-Jan-19 |     END     |
| 103561375 | 7750 | 10-Jan-19 | 10-Jan-19 |    START    |
| 103561375 | 7750 | 10-Jan-19 | 10-Jan-19 |     END     |
| 103561454 | 6106 | 31-Jan-19 | 31-Jan-19 |    START    |
| 103561454 | 6106 | 31-Jan-19 | 31-Jan-19 |     END     |
| 103561454 | 6111 |  4-Feb-19 |  4-Feb-19 |    START    |
| 103561454 | 6111 |  4-Feb-19 |  4-Feb-19 |     END     |
| 103561454 | 6900 |  4-Feb-19 |  4-Feb-19 |    START    |
| 103561454 | 6900 |  4-Feb-19 |  4-Feb-19 |     END     |
| 103561454 | 6950 |  4-Feb-19 |  4-Feb-19 |    START    |
| 103561454 | 6950 |  4-Feb-19 |  4-Feb-19 |     END     |
| 103561454 | 7000 |  4-Feb-19 |  4-Feb-19 |    START    |
| 103561454 | 7000 |  4-Feb-19 |  4-Feb-19 |     END     |
| 103561454 | 7050 |  5-Feb-19 |  5-Feb-19 |    START    |
| 103561454 | 7050 |  5-Feb-19 |  5-Feb-19 |     END     |
| 103561454 | 7100 |  6-Feb-19 |  6-Feb-19 |    START    |
| 103561454 | 7100 |  6-Feb-19 |  6-Feb-19 |     END     |
| 103561454 | 7200 |  9-Feb-19 |  9-Feb-19 |    START    |
| 103561454 | 7200 |  9-Feb-19 |  9-Feb-19 |     END     |
| 103561454 | 7300 |  9-Feb-19 |  9-Feb-19 |    START    |
| 103561454 | 7300 |  9-Feb-19 |  9-Feb-19 |     END     |
| 103561454 | 7400 |  9-Feb-19 |  9-Feb-19 |    START    |
| 103561454 | 7400 |  9-Feb-19 |  9-Feb-19 |     END     |
| 103561454 | 7450 | 11-Feb-19 | 11-Feb-19 |    START    |
| 103561454 | 7450 | 11-Feb-19 | 11-Feb-19 |   PROCESS   |
| 103561454 | 7450 | 11-Feb-19 | 14-Feb-19 |    START    |
| 103561454 | 7450 | 11-Feb-19 | 14-Feb-19 |     END     |
| 103561454 | 7550 | 14-Feb-19 | 14-Feb-19 |    START    |
| 103561454 | 7550 | 14-Feb-19 | 14-Feb-19 |     END     |
| 103561454 | 7700 | 16-Feb-19 | 16-Feb-19 |    START    |
| 103561454 | 7700 | 16-Feb-19 | 16-Feb-19 |     END     |
| 103561454 | 7750 | 18-Feb-19 | 18-Feb-19 |    START    |
| 103561454 | 7750 | 18-Feb-19 | 18-Feb-19 |     END     |

目标是：

对于每个订单，以及每个订单中的每个步骤，计算它的排队时间，这是从上一步的LAST END开始的时间DATE 到当前步骤的 FIRST START DATE（此步骤排队等待执行的时间） .

So basically, for each row Order and Step combination, I need to find the last END date (when ProcessCode = END) and the first START date (when ProcessCode = START). Then, subtract those two and report back the value.

我试过：

SELECT
    Order,
    Step,
    (MAX(StepEnd) OVER PARTITION BY (Order, Step) - LAG(MIN(StepStart) OVER PARTITION BY (Order, Step), 1, null)) OVER PARTITION BY (
    Order, Step) AS QueueTime

FROM
    thetable

但不断收到与缺少右括号相关的错误。

我如何才能编写查询来获得结果，例如，步骤 7450 将是 1。（这些实际上是真实数据库中的 datetime 字段，但是当我编辑一些结果时它变成了日期）

Answer 1

关于 over partition by 的括号语法有点错误，应该是：

MAX("StepEnd") OVER (PARTITION BY "Order", "Step")
MIN("StepStart") OVER (PARTITION BY "Order", "Step")

我已经尝试修正你的说法，见下文：

SELECT
    "Order",
    "Step", 
    MAX("StepEnd") -
    LAG(MIN("StepStart"), 1, NULL) OVER (ORDER BY MIN("StepStart")) AS QueueTime
    FROM
  Table1
group by "Order","Step"

您可以在 fiddle 中查看我的结果。

可以找到 Lag 函数的一些有用示例 here。似乎它总是需要一个 order by.

Answer 2

我认为您需要使用 MIN 和 MAX 分析函数，如下所示。

SELECT
    Order,
    Step,
    MAX(StepEnd) OVER PARTITION BY (Order, Step) 
    - MIN(StepStart) OVER PARTITION BY (Order, Step) AS QueueTime
    FROM
    thetable

干杯！！

有条件地执行滞后的 MAX 和 MIN 计算 - Oracle SQL

Conditionally perform a lagging MAX and MIN calculation - Oracle SQL

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aggregate-functions

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