甲骨文獲得超過訂單組的第一價值

我嘗試了許多oracle分析函數來實現我的需求，但無法實現。這裏是一個簡單的例子：甲骨文獲得超過訂單組的第一價值

WITH W1 AS (
SELECT 100 key1, 0 key2, 0 key3, 'open' status, 'date1' date_column FROM DUAL UNION ALL 
SELECT 100 key1, 0 key2, 1 key3, 'open' status, 'date2' date_column FROM DUAL UNION ALL 
SELECT 100 key1, 0 key2, 2 key3, 'close' status, 'date3' date_column FROM DUAL UNION ALL 
SELECT 100 key1, 0 key2, 3 key3, 'close' status, 'date4' date_column FROM DUAL UNION ALL 
SELECT 100 key1, 0 key2, 4 key3, 'close' status, 'date5' date_column FROM DUAL UNION ALL 
SELECT 100 key1, 0 key2, 5 key3, 'open' status, 'date6' date_column FROM DUAL UNION ALL 
SELECT 100 key1, 0 key2, 6 key3, 'open' status, 'date7' date_column FROM DUAL) 
SELECT W1.*, 
     CASE WHEN LAG(status,1) OVER(PARTITION BY key1,key2 ORDER BY key3) <> status THEN date_column 
      ELSE FIRST_VALUE(date_column) OVER (PARTITION BY key1,key2,status ORDER BY key3 RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) END as DESIRED 
    FROM W1 
ORDER BY 1,2,3

我想，當狀態改變克服組有序第一個值。我只需要在DESIRED列上的最後一行應該是「date6」

你有什麼建議嗎？ Oracle 11gr2

謝謝。

來源

2016-06-30 Deniz

你能告訴你想要的輸出？ –

只有查詢結果的最後一行需要是「date6」 – Deniz

從Oracle 12C R1（12.1）開始，有一排限制性條款

可以使用FETCH FIRST 1 ROWS ONLY;

WITH W1 AS (
    SELECT 100 key1, 0 key2, 0 key3, 'open' status, 'date1' date_column FROM DUAL UNION ALL 
    SELECT 100 key1, 0 key2, 1 key3, 'open' status, 'date2' date_column FROM DUAL UNION ALL 
    SELECT 100 key1, 0 key2, 2 key3, 'close' status, 'date3' date_column FROM DUAL UNION ALL 
    SELECT 100 key1, 0 key2, 3 key3, 'close' status, 'date4' date_column FROM DUAL UNION ALL 
    SELECT 100 key1, 0 key2, 4 key3, 'close' status, 'date5' date_column FROM DUAL UNION ALL 
    SELECT 100 key1, 0 key2, 5 key3, 'open' status, 'date6' date_column FROM DUAL UNION ALL 
    SELECT 100 key1, 0 key2, 6 key3, 'open' status, 'date7' date_column FROM DUAL) 
    SELECT W1.*, 
      CASE WHEN LAG(status,1) OVER(PARTITION BY key1,key2 ORDER BY key3) <> status THEN date_column 
       ELSE FIRST_VALUE(date_column) OVER (PARTITION BY key1,key2,status ORDER BY key3 RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) END as DESIRED 
     FROM W1 
    ORDER BY 1,2,3 
    FETCH FIRST 1 ROWS ONLY;

看到的文檔https://oracle-base.com/articles/12c/row-limiting-clause-for-top-n-queries-12cr1

來源

2016-06-30 06:44:37 scaisEdge

這不起作用 – Deniz

我發現這個https://oracle-base.com/articles/12c/row-limiting-clause-for-top-n -queries-12cr1 ...你有錯誤嗎？ – scaisEdge

甲骨文獲得超過訂單組的第一價值

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