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我有一張類似於以下內容的表。這是緊急護理中心的數據,與當病人被賦予一個房間ROOMED_DT是,和CHECKOUT_DT是病人被清除離開的時候了:跨行和兩組計算平均時間差
PAT_ID ROOMED_DT CHECKOUT_DT ROOM_NUM
1 11/12/2015 03:22PM 11/12/2015 06:30PM Room 4
2 11/12/2015 07:40PM 11/12/2015 10:30PM Room 4
3 11/12/2015 10:55PM 11/12/2015 11:30PM Room 4
4 11/12/2015 09:45AM 11/12/2015 12:00PM Room 5
5 11/12/2015 12:02PM 11/12/2015 01:30PM Room 5
6 11/12/2015 02:25PM 11/12/2015 04:30PM Room 5
7 11/13/2015 07:22AM 11/13/2015 08:04AM Room 2
8 11/13/2015 09:40AM 11/13/2015 10:30AM Room 2
9 11/13/2015 10:55AM 11/13/2015 11:55AM Room 2
10 11/13/2015 12:45PM 11/13/2015 02:00PM Room 1
11 11/13/2015 04:02PM 11/13/2015 05:30PM Room 1
12 11/13/2015 05:25PM 11/13/2015 08:30PM Room 1
我想計算的平均時間從前一位患者被清除離開(CHECKOUT_DT)到每個房間每天出現下一位患者(ROOMED_DT)的時間,因此結果看起來像這樣(爲了這個目的,我將平均數字提高了的視覺),與下一個病人在幾分鐘內的時間。
SERVICE_DT TIME_TO_NEXT_PAT
11/12/2015 65.7
11/13/2015 72.4
但我不知道如何解釋在多個患者和多個房間CHECKOUT_DT和ROOMED_DT之間的差異。有沒有人有任何想法?我正在使用Netezza。