Oracle從主鍵列中選擇返回空值？

我有一個從查詢創建的視圖。該查詢從兩個連接在一起的表中檢索數據。其中一個使用主鍵進行內部連接。但數據在主鍵上返回空結果。這裏有什麼問題？Oracle從主鍵列中選擇返回空值？

CREATE TABLE orderinfo 
(
    orderid VARCHAR2 (20), 
    qtty  NUMBER (20, 0), 
    price  NUMBER (20, 0) 
) 
/

ALTER TABLE orderinfo ADD CONSTRAINT orderinfo_pk PRIMARY KEY (orderid) 
/
INSERT INTO orderinfo (orderid, qtty, price) 
    VALUES ('OD00001', 1000, 15000); 

INSERT INTO orderinfo (orderid, qtty, price) 
    VALUES ('OD00002', 2000, 15000); 

INSERT INTO orderinfo (orderid, qtty, price) 
    VALUES ('OD00003', 3000, 15000); 

INSERT INTO orderinfo (orderid, qtty, price) 
    VALUES ('OD00004', 4000, 15000); 

COMMIT 
/

create table ordersend 
(
    orderid varchar2(20), 
    orderstatus varchar2(3) 
) 
ALTER TABLE ordersend ADD CONSTRAINT ordersend_pk PRIMARY KEY (orderid) 
/

INSERT INTO ordersend (orderid, status) 
    VALUES ('OD00001', 'N'); 

INSERT INTO ordersend (orderid, status) 
    VALUES ('OD00002', 'N'); 

INSERT INTO ordersend (orderid, status) 
    VALUES ('OD00003', 'N'); 

INSERT INTO ordersend (orderid, status) 
    VALUES ('OD00004', 'N'); 

COMMIT 
/

CREATE VIEW vw_ordersendstatus 
AS 
    SELECT "orderid", 
      "qtty", 
      "price", 
      "status" 
     FROM (SELECT inf.orderid, 
         inf.qtty, 
         inf.price, 
         send.status 
       FROM orderinfo inf, ordersend send 
       WHERE inf.orderid = send.orderid AND status = 'N') 
/
CREATE TABLE orderblock 
(
    orderid VARCHAR2 (20), 
    qtty  NUMBER (20, 0), 
    price  NUMBER (20, 0) 
) 
/
CREATE PROCEDURE pr_sendorder 
IS 
    CURSOR c_send 
    IS 
     SELECT orderid orderid, 
       qtty, 
       price, 
       status 
      FROM vw_ordersendstatus; 
BEGIN 
    FOR i IN c_send 
    LOOP 
     INSERT INTO orderblock (orderid, qtty, price) 
      VALUES (i.orderid, i.qtty, i.price); 

     UPDATE ordersend 
      SET status = 'B' 
     WHERE orderid = i.orderid; 
    END LOOP; 
EXCEPTION 
    WHEN OTHERS 
    THEN 
     RAISE '-1'; 
END;

然後 SELECT * FROM orderblock

返回上OrderID字段

爲什麼空值??? 請幫助

來源

2014-08-28 Phu Nguyen

您的視圖不能成功編譯，因爲你在'select'使用區分大小寫的標識符的當子查詢不使用這些標識符。因爲沒有'status'列，所以'insert'語句到'ordersend'失敗。 – 2014-08-28 03:47:44

的創建表ordersend不包含在視圖中提到的狀態欄。

在視圖中，你已經使用了加引號，小寫列名。這些引用強制Oracle將它們視爲區分大小寫。

如果混合使用帶引號和不帶引號的列/變量名稱，則可能會出現未引號orderid從大寫的ORDERID或未引用的orderid獲取其值的情況，而不是您所期望的帶引號的小寫「orderid」。最好避免列，變量和表格的引用標識符。

沒有一個完全工作的腳本，這是很難肯定

來源

2014-08-28 03:57:47

感謝加里，在我的問題，我有一個錯誤的AT視圖。正確的是：

INSERT INTO ordersend (orderid, orderstatus) 
    VALUES ('OD00001', 'N'); 

INSERT INTO ordersend (orderid, orderstatus) 
    VALUES ('OD00002', 'N'); 

INSERT INTO ordersend (orderid, orderstatus) 
    VALUES ('OD00003', 'N'); 

INSERT INTO ordersend (orderid, orderstatus) 
    VALUES ('OD00004', 'N'); 

CREATE VIEW vw_ordersendstatus 
AS 
    SELECT "ORDERID", 
      "QTTY", 
      "PRICE", 
      "STATUS" 
     FROM (SELECT inf.orderid, 
         inf.qtty, 
         inf.price, 
         send.orderstatus status 
       FROM orderinfo inf, ordersend send 
       WHERE inf.orderid = send.orderid AND orderstatus = 'N')

來源

2014-08-28 05:17:47

Oracle從主鍵列中選擇返回空值？

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