的Oracle SQL更新與rowover分區

Question

爲什麼我得到錯誤B1.EMPLOYEE_ID是SQL下面無效的標識符：

UPDATE TABLE_1 A1 
    SET A1.ADDL_SEQ = (SELECT SEQ 
         FROM (SELECT ROW_NUMBER() OVER (PARTITION BY EMPLOYEE_ID 
                 ORDER BY EMPLOYEE_ID, ERNCD) SEQ 
           FROM TABLE_1) B1 
         WHERE B1.EMPLOYEE_ID=A1.EMPLOYEE_ID); 

Answer 1

你可以寫你的更新語句也是這樣：

UPDATE 
    (SELECT EMPLOYEE_ID, ADDL_SEQ, 
     ROW_NUMBER() OVER (PARTITION BY EMPLOYEE_ID ORDER BY EMPLOYEE_ID, ERNCD) AS SEQ 
    FROM TABLE_1) 
SET ADDL_SEQ = SEQ; 

Answer 2

添加case case，像這樣

UPDATE TABLE_1 A1 
     SET A1.ADDL_SEQ = (SELECT 
          (CASE WHEN employee_id = ERNCD THEN seq ELSE NULL END) AS SEQ 
          FROM (SELECT ROW_NUMBER() OVER (PARTITION BY EMPLOYEE_ID 
                  ORDER BY EMPLOYEE_ID, ERNCD) SEQ 
            FROM TABLE_1) B1 
          WHERE B1.EMPLOYEE_ID=A1.EMPLOYEE_ID); 

我不認爲你需要WHERE條件，但它的k IND的硬數據

Answer 3

您應該添加EMPLOYEE_ID想象到您的B1內查詢：

UPDATE TABLE_1 A1 
    SET A1.ADDL_SEQ = (SELECT SEQ 
         FROM (SELECT EMPLOYEE_ID,ROW_NUMBER() OVER (PARTITION BY EMPLOYEE_ID 
                 ORDER BY EMPLOYEE_ID, ERNCD) SEQ 
           FROM TABLE_1) B1 
         WHERE B1.EMPLOYEE_ID=A1.EMPLOYEE_ID);