拷貝列數據到下一行上，當在SQL條件

Question

attendance id   status activity 
1      0  xyz 
2      1  abc 
3      2  abc 
4      1 

我有一個塔，在其中ID是爲前一個唯一值時狀態= 2更新的下一個出席ID和狀態= 2的活性複製到下一個考勤編號即ie 4

我該怎麼做？

Answer 1

如果您的意思是您想將狀態複製到下一個數據行。你可以使用這個聲明。我已經添加了一些演示代碼。

CREATE TABLE #temp(attendance_id int identity(1,1), status int, acitivity nvarchar(10)) 

INSERT INTO #temp(status, acitivity) 
VALUES(0, N'xyz'),(1,N'abc'),(2,N'abc'),(3,NULL) 

-- see what happens 
SELECT t.attendance_id, t.status as oldStatus, ISNULL(shifting.status,t.status),t.acitivity 
FROM #temp t 
LEFT JOIN (
    SELECT status, ROW_NUMBER() OVER (ORDER BY attendance_id) +1 as rn 
    FROM #temp 
    ) as shifting 
    ON t.attendance_id = shifting.rn 

-- the update itself 
UPDATE t 
SET status = ISNULL(shifting.status,t.status) 
FROM #temp t 
LEFT JOIN (
    SELECT status, ROW_NUMBER() OVER (ORDER BY attendance_id) +1 as rn 
    FROM #temp 
    ) as shifting 
    ON t.attendance_id = shifting.rn 

SELECT * FROM #temp 

DROP TABLE #temp