添加一個數字上的條件

Question

我有一個看起來像這樣（ID是PK標識字段）

    ID Date     Condition  Call_Count  
    1 2015-03-02 14:05:05 Terminated  0  
    2 2015-03-02 14:05:10 Transferred 0  
    3 2015-03-02 14:06:02 Transferred 0  
    4 2015-03-02 14:07:00 Transferred 0  
    5 2015-03-02 14:07:50 Terminated  0  
    6 2015-03-02 14:07:60 Transferred 0  
    7 2015-03-02 14:08:55 Terminated  0  
    8 2015-03-02 14:08:56 Terminated  0   

我曾嘗試下面的SQL Server表增加一個SQL Server表：

DECLARE @LoopId INT = 1, 
    @Call_Count INT = 1, 
    @callend INT, 
    @maxId INT, 
    @LoopCounter INT 

Select @MaxId = max(ID) from Table1  

WHILE(@LoopId <= @MaxId) 
BEGIN 
    SELECT @callend = charindex('Terminated', Reason) 
    from Table1 where ID = @LoopId 

    set @Call_Count = @Call_Count + case when @callend > 0 then 1 else 0 end 

    IF @LoopId > 1 
    begin 
    update Table1 
     set Call_Counter = @Call_Count 
     WHERE Id = @LoopID 
    end 

    SET @LoopId = @LoopId + 1   
END 

我得到的結果是這樣的：

    ID Date     Condition  Call_Count  
    1 2015-03-02 14:05:05 Terminated  1 
    2 2015-03-02 14:05:05 Terminated  2 
    3 2015-03-02 14:05:05 Terminated  3 
    4 2015-03-02 14:05:05 Terminated  4 
    5 2015-03-02 14:05:10 Transferred 4  
    6 2015-03-02 14:06:02 Transferred 4  
    7 2015-03-02 14:07:00 Transferred 4  
    8 2015-03-02 14:07:50 Terminated  5  
    9 2015-03-02 14:07:60 Transferred 5  
    10 2015-03-02 14:08:55 Terminated  6  
    11 2015-03-02 14:08:56 Terminated  6 

我需要一個ID字段生成的都會有這樣的結果，它的東東ds將最後一個「終止」之後的數字更改爲將一個「呼叫」置於一個組中。

    ID Date     Condition  Call_Count  
    1 2015-03-02 14:05:05 Terminated  1 
    2 2015-03-02 14:05:05 Terminated  2 
    3 2015-03-02 14:05:05 Terminated  3 
    4 2015-03-02 14:05:05 Terminated  4 
    5 2015-03-02 14:05:10 Transferred 5  
    6 2015-03-02 14:06:02 Transferred 5  
    7 2015-03-02 14:07:00 Transferred 5  
    8 2015-03-02 14:07:50 Terminated  5  
    9 2015-03-02 14:07:60 Transferred 6  
    10 2015-03-02 14:08:55 Terminated  6  
    11 2015-03-02 14:08:56 Terminated  7 

Answer 1

最簡單的辦法，應該在SQL Server的任何版本的使用與 更新的內連接到相關的派生表 一個相關子查詢。

（保存我們請這一步在你未來的問題 - 如果你想這樣做，是你自己，我會張貼在第一attampt正確和測試的解決方案）創建和填充示例表

CREATE TABLE Table1 
(
    ID int identity(1,1), 
    [Date] datetime, 
    Condition nvarchar(20), 
    Call_Counter int 
) 
INSERT INTO Table1 ([Date], Condition) VALUES 
('2015-03-02 14:05:05', 'Terminated'), 
('2015-03-02 14:05:10', 'Transferred'), 
('2015-03-02 14:06:02', 'Transferred'), 
('2015-03-02 14:07:00', 'Transferred'), 
('2015-03-02 14:07:50', 'Terminated'), 
('2015-03-02 14:07:59', 'Transferred'), 
('2015-03-02 14:08:55', 'Terminated'), 
('2015-03-02 14:08:56', 'Terminated') 

update語句：

UPDATE t1 
SET Call_Counter = 
    (
     SELECT COUNT(*) As CallCounter 
     FROM Table1 t2 
     WHERE Condition = 'Terminated' 
     AND t2.ID <= t1.ID 
    ) 
FROM Table1 t1 

See live demo on rextester.

第一ATT搶先（錯誤）

UPDATE t1 
SET Call_Counter = CallCounter 
FROM Table1 t1 
INNER JOIN 
(
    SELECT COUNT(*) As CallCounter 
    FROM Table1 t2 
    WHERE Condition = 'Terminated' 
    AND ID <= t1.ID 
) t3 

Answer 2

類似的解決方案，因此瑣。但我寧願先計算所有的值。還要利用窗口功能。

SQL DEMO

WITH CTE as (
    SELECT ID , 
      COUNT(CASE WHEN [Condition] = 'Terminated' THEN 1 END) 
      OVER (ORDER BY [ID]) as rn 
    FROM Table1 
)  
UPDATE A 
SET [Call_Count] = CASE WHEN [Condition] = 'Terminated' 
         THEN B.rn 
         ELSE B.rn + 1 
        END 
FROM Table1 A 
JOIN CTE B 
    ON A.ID = B.ID;