如何填補此前的紀錄

我有一個表，即無，日期和步驟如何填補此前的紀錄

+---------+----------------------------+----------------------------+ 
| No |      Date |   Step   | 
+---------+----------------------------+----------------------------+ 
| 643995G | 03/12/2012 3:22:48 PM  | TransferInStart   | 
| 643995G | 03/12/2012 3:22:50 PM  |       | 
| 643995G | 15/02/2013 10:53:57 AM  | Hold      | 
| 643995G | 15/02/2013 10:54:00 AM  | Hold Copy Processing Start | 
| 643995G | 20/02/2013 4:38:26 PM  |       | 
| 643995G | 21/02/2013 3:27:01 PM  | ExceptionStart    | 
| 643995G | 22/02/2013 9:38:32 AM  | ExceptionEnd    | 
| 643995G | 22/02/2013 9:39:32 AM  |       | 
| 643995G | 22/02/2013 10:04:53 AM  |       | 
| 643995G | 22/02/2013 10:04:56 AM  |       | 
| 643995G | 25/02/2013 10:48:18 AM  | TransferIn     | 
| 643995G | 25/02/2013 10:48:19 AM  | CatalougingStart   | 
| 643995G | 27/02/2013 1:59:44 PM  |       | 
| 643995G | 27/02/2013 1:59:45 PM  |       | 
| 643995G | 27/02/2013 2:05:01 PM  | Catalouging    | 
| 643995G | 27/02/2013 2:05:02 PM  | ProcessingStart   | 
| 643995G | 27/02/2013 6:09:51 PM  |       | 
| 643995G | 27/02/2013 6:09:52 PM  |       | 
| 643995G | 04/03/2013 2:03:16 PM  |       | 
| 643995G | 04/03/2013 2:03:17 PM  | Hold Copy Processing Start | 
| 643995G | 11/03/2013 2:27:14 PM  |       | 
| 643995G | 12/03/2013 10:09:55 AM  | ExceptionStart    | 
| 643995G | 12/03/2013 10:10:27 AM  | ExceptionEnd    | 
| 643995G | 12/03/2013 10:10:52 AM  |       | 
| 643995G | 12/03/2013 10:11:27 AM  |       | 
| 643995G | 12/03/2013 10:28:37 AM  |       | 
| 643995G | 12/03/2013 10:46:21 AM  | Processing     | 
+---------+----------------------------+----------------------------+

以下數據想填補與上一步中的空記錄。填寫上述值後，我發現異常開始和異常結束想填寫上述值。請參考吹步驟2和步驟3作爲輸出示例。

+---------+------------------------+----------------------------+----------------------------+----------------------------+ 
| No |   Date   |  ProcessStep   |   Step2   |   Step3   | 
+---------+------------------------+----------------------------+----------------------------+----------------------------+ 
| 643995G | 03/12/2012 3:22:48 PM | TransferInStart   | TransferInStart   | TransferInStart   | 
| 643995G | 03/12/2012 3:22:50 PM |       | TransferInStart   | TransferInStart   | 
| 643995G | 15/02/2013 10:53:57 AM | Hold      | Hold      | Hold      | 
| 643995G | 15/02/2013 10:54:00 AM | Hold Copy Processing Start | Hold Copy Processing Start | Hold Copy Processing Start | 
| 643995G | 20/02/2013 4:38:26 PM |       | Hold Copy Processing Start | Hold Copy Processing Start | 
| 643995G | 21/02/2013 3:27:01 PM | ExceptionStart    | ExceptionStart    | Hold Copy Processing Start | 
| 643995G | 22/02/2013 9:38:32 AM | ExceptionEnd    | ExceptionEnd    | Hold Copy Processing Start | 
| 643995G | 22/02/2013 9:39:32 AM |       | ExceptionEnd    | Hold Copy Processing Start | 
| 643995G | 22/02/2013 10:04:53 AM |       | ExceptionEnd    | Hold Copy Processing Start | 
| 643995G | 22/02/2013 10:04:56 AM |       | ExceptionEnd    | Hold Copy Processing Start | 
| 643995G | 25/02/2013 10:48:18 AM | TransferIn     | TransferIn     | TransferIn     | 
| 643995G | 25/02/2013 10:48:19 AM | CatalougingStart   | CatalougingStart   | CatalougingStart   | 
| 643995G | 27/02/2013 1:59:44 PM |       | CatalougingStart   | CatalougingStart   | 
| 643995G | 27/02/2013 1:59:45 PM |       | CatalougingStart   | CatalougingStart   | 
| 643995G | 27/02/2013 2:05:01 PM | Catalouging    | Catalouging    | Catalouging    | 
| 643995G | 27/02/2013 2:05:02 PM | ProcessingStart   | ProcessingStart   | ProcessingStart   | 
| 643995G | 27/02/2013 6:09:51 PM |       | ProcessingStart   | ProcessingStart   | 
| 643995G | 27/02/2013 6:09:52 PM |       | ProcessingStart   | ProcessingStart   | 
| 643995G | 04/03/2013 2:03:16 PM |       | ProcessingStart   | ProcessingStart   | 
| 643995G | 04/03/2013 2:03:17 PM | Hold Copy Processing Start | Hold Copy Processing Start | Hold Copy Processing Start | 
| 643995G | 11/03/2013 2:27:14 PM |       | Hold Copy Processing Start | Hold Copy Processing Start | 
| 643995G | 12/03/2013 10:09:55 AM | ExceptionStart    | ExceptionStart    | Hold Copy Processing Start | 
| 643995G | 12/03/2013 10:10:27 AM | ExceptionEnd    | ExceptionEnd    | Hold Copy Processing Start | 
| 643995G | 12/03/2013 10:10:52 AM |       | ExceptionEnd    | Hold Copy Processing Start | 
| 643995G | 12/03/2013 10:11:27 AM |       | ExceptionEnd    | Hold Copy Processing Start | 
| 643995G | 12/03/2013 10:28:37 AM |       | ExceptionEnd    | Hold Copy Processing Start | 
| 643995G | 12/03/2013 10:46:21 AM | Processing     | Processing     | Processing     | 
+---------+------------------------+----------------------------+----------------------------+----------------------------+

Input

Output

來源

2016-04-23 kitees

請用您正在使用的數據庫標記您的問題。 –

不同的數據庫有解決這個問題的不同方法。一種方法使用select中的相關子查詢。一個典型的方法可以在ANSI標準SQL表示爲：

update t 
    set step2 = (select t2.processstep 
        from t t2 
        where t2.no = t.no and 
         t2.date <= t.date and 
         t2.processstep is not null 
        order by date desc 
        fetch first 1 row only 
       );

在一些數據庫中，你可以使用limit或top拿到第一排。即便如此，這可能不適用於所有數據庫，但類似的情況可能會起作用。

來源

2016-04-23 23:51:01

如何填補此前的紀錄

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