問題的日期範圍內創建

Question

我一直在創造的日期範圍，但在某些情況下，有一個問題：

這是我有：TABLE_1

date   customer_id  status  total 
----   ------------- -------- ------- 
20120201   1    a   10 
20120202   1    a   20 
20120203   1    b   20 
20120204   1    b   20 
20120205   1    a   20 
20120206   1    a   20 
20120201   2    d   30 
20120202   2    e   40 

我的程序執行後，我有這樣的：TABLE_2

customer_id  status  start_date  end_date 
------------- -------- -----------  --------- 
    1    a   20120201  NULL 
    1    b   20120203  20120131 
    2    d   20120201  20120201 
    2    e   20120202  NULL 

但是，這是我想要的，與日期範圍表基於CUSTOMER_ID和狀態（END_DATE代表與最近的日期登記）：TABLE_3

customer_id  status  start_date  end_date 
------------- -------- -----------  --------- 
    1    a   20120201  20120202 
    1    b   20120203  20120204 
    1    a   20120205  NULL 
    2    d   20120201  20120201 
    2    e   20120202  NULL 

我的存儲過程是這樣的：

;WITH TEMP AS (
SELECT 
    Date 
    customer_id 
    status 
FROM table_1 
GROUP BY 
    date, 
    customer_id, 
    status 
) 
,TEMP2 AS (
    SELECT 
     ID = ROW_NUMBER() OVER(PARTITION BY customer_id ORDER BY MAX(date) DESC), 
     start_date = MIN(date), 
     end_date = MAX(date), 
     [customer_id], 
     [status] 
    FROM TEMP 
    GROUP BY 
     [customer_id], 
     [status] 
) 
SELECT 
    A.customer_id, 
    A.status, 
    A.start_date, 
    end_date  = DATEADD(DAY,-1,B.start_date) 
FROM TEMP2 A 
LEFT JOIN TEMP2 B 
    ON A.customer_id = B.customer_id 
    AND A.ID = B.ID + 1 

我知道我的錯誤是在創建CTE TEMP2的，因爲這個代碼不容對於狀態的CUSTOMER_ID有兩個出現在不同的歧視時間範圍，「按組」一句

基礎上，我不能弄清楚如何做到這一點...

Answer 1

試試這個。希望它現在可以工作。

DECLARE @table_1 TABLE ( 
    date DATETIME, 
    customer_id INT, 
    status CHAR(1), 
    total INT 
) 

INSERT @table_1 (date, customer_id, status, total) 
VALUES 
('20120201', 1, 'a', 10), 
('20120202', 1, 'a', 20), 
('20120203', 1, 'b', 20), 
('20120204', 1, 'b', 20), 
('20120205', 1, 'a', 20), 
('20120206', 1, 'a', 20), 
('20120201', 2, 'd', 30), 
('20120202', 2, 'e', 40) 



;WITH CTE_1 AS ( 
    SELECT 
     customer_id, 
     status, 
     date, 
     ROW_NUMBER() OVER(PARTITION BY customer_id ORDER BY date ASC) AS seq 
    FROM @table_1  
), 
CTE_2 AS (
    SELECT 
     customer_id, 
     status, 
     date, 
     seq, 
     1 AS flg, 
     1 AS seq2 
    FROM CTE_1 
    WHERE 
     seq = 1 

    UNION ALL 

    SELECT 
     CTE_1.customer_id, 
     CTE_1.status, 
     CTE_1.date, 
     CTE_1.seq, 
     CASE WHEN CTE_2.status = CTE_1.status THEN 0 ELSE 1 END, 
     CASE WHEN CTE_2.status = CTE_1.status THEN CTE_2.seq2 ELSE CTE_2.seq2 + 1 END 
    FROM CTE_1 
    INNER JOIN CTE_2 
     ON CTE_1.customer_id = CTE_2.customer_id 
      AND CTE_1.seq = CTE_2.seq + 1 
) 
SELECT 
    st.customer_id, 
    st.status, 
    st.date AS start_date, 
    DATEADD(DAY, -1, en.date) AS end_date 
FROM CTE_2 AS st 
LEFT JOIN CTE_2 AS en 
    ON st.customer_id = en.customer_id 
     AND st.seq2 = en.seq2 - 1 
     AND en.flg = 1 
WHERE 
    st.flg = 1 
ORDER BY 
    st.customer_id, 
    st.seq2