Question

我正在尝试执行以下程序，但继续得到以下内容：

CODE：

SET SERVEROUTPUT ON
DECLARE
  aID VARCHAR2(4):= '&AuthID';
  aName BK_AUTHOR.FNAME%TYPE;
  aSurname BK_AUTHOR.LNAME%TYPE;
  bTit BK_BOOKS.TITLE%TYPE;
  bCat BK_BOOKS.CATEGORY%TYPE;
  bPrice BK_COSTS.COST%TYPE;

BEGIN
 book_info(aID,aName,aSurname,bTit,bCat,bPrice);
  DBMS_OUTPUT.PUT_LINE(aName||'-'||aSurname||'wrote the book ('||bTit||') that is in category '||bCat||' and it cost R'||TO_CHAR(bPrice,'99999.99'));
END;
/

错误

ERROR at line 1:
ORA-01422: exact fetch returns more than requested number of rows
ORA-06512: at "SYS.BOOK_INFO", line 13
ORA-06512: at line 9

从评论中添加代码：

CREATE OR REPLACE PROCEDURE book_info(
    AuthID IN OUT VARCHAR2,
    Name OUT BK_AUTHOR.FNAME%TYPE,
    Surname OUT BK_AUTHOR.LNAME%TYPE,
    Tit OUT BK_BOOKS.TITLE%TYPE,
    Cat OUT BK_BOOKS.CATEGORY%TYPE,
    Price OUT BK_COSTS.COST%TYPE )
IS
BEGIN
  SELECT FNAME,
    LNAME,
    TITLE,
    CATEGORY,
    COST
  INTO Name,
    Surname,
    Tit,
    Cat,
    Price
  FROM BK_BOOKS,
    BK_AUTHOR,
    BK_COSTS
  WHERE BK_COSTS.ISBN   = BK_BOOKS.ISBN
  AND BK_BOOKS.AUTHORID = AuthID;
END book_info;
/

Answer 1

可能是由于查看book_info代码的多种原因。

首先 - bk_books和bk_author之间存在交叉连接。您需要在这两个表之间添加连接条件，例如 -

WHERE BK_COSTS.ISBN = BK_BOOKS.ISBN AND bk_books.authorid = bk_author.authorid AND AND BK_BOOKS.AUTHORID = AuthID

您还应该根据Authorid检查这些表的结果连接中的重复项。

修改：忘记提及，请不要将SYS用户用于任何与开发相关的活动，例如创建程序或功能。从错误消息中，似乎book_info过程在SYS用户中。除非您是DBA并将其用于与sysdba相关的活动，否则不应该登录此用户。

错误 - ORA-01422：精确提取返回超过请求的行数

1 个答案: