將Oracle分層查詢轉換爲MariaDB

Question

我正在將oracle查詢轉換爲maria db。在MariaDB中沒有分層查詢，如「開始......連接...」。所以我不得不創建類似於「以......開頭......」的查詢，但它看起來很難。你們能幫我嗎？

SELECT * 
     FROM 
      (SELECT T2.JOB_TYPE, 
        T2.COMPONENT_TYPE, 
        T1.POOL_SEQ, 
        FN_GET_CODE_VALUE('componenttype',T2.COMPONENT_TYPE) AS COMPONENT_TYPE_NM, 
        MIN(T1.WORKFLOW_SEQ)WORKFLOW_SEQ, 
        MIN(T1.UPPER_WORKFLOW_SEQ)UPPER_WORKFLOW_SEQ, 
        MAX(T1.DEFAULT_JOB_SEQ)DEFAULT_JOB_SEQ, 
        T1.WORKFLOW_TYPE, 
        /* MAX(T1.WORKFLOW_TYPE)WORKFLOW_TYPE, */ 
        COUNT(CASE T1.JOB_STATE WHEN '01' THEN 1 END)STATE_01_CNT, 
        COUNT(CASE T1.JOB_STATE WHEN '02' THEN 1 END)STATE_02_CNT, 
        COUNT(CASE T1.JOB_STATE WHEN '03' THEN 1 END)STATE_03_CNT, 
        COUNT(CASE T1.JOB_RESULT WHEN '20' THEN 1 END)ERCNT, 
        COUNT(CASE T1.JOB_RESULT WHEN '10' THEN 1 END)END_CNT, 
        COUNT(*)TOT_CNT 
        /* ,MAX(T1.POOL_SEQ)POOL_SEQ */ 
       FROM JOB_TBL T1, 
        SERVER_POOL_TBL T2 
      WHERE T1.POOL_SEQ = T2.POOL_SEQ 

     )T 
    START WITH UPPER_WORKFLOW_SEQ IS NULL 
CONNECT BY UPPER_WORKFLOW_SEQ = PRIOR WORKFLOW_SEQ 

Answer 1

使用Recirsive CTE。 connect by是Oracle專有擴展，在CTE「發明」之前引入。遞歸CTE也更通用。