Question

desc book_data;

Name       Null Type         
---------- ---- ------------ 
BOOK_NAME       VARCHAR2(50) 
BOOK_PRICE      NUMBER       
BOOK_SSN        VARCHAR2(50) 



DECLARE
  TYPE book_rec is record(
    book_name  varchar2(50),
    book_price number,
    book_ssn   varchar2(50)
    );
  type book_tbl_type is table of book_rec;
  book_tbl1 book_tbl_type := book_tbl_type();
BEGIN

  SELECT BOOK_NAME, BOOK_PRICE/*,book_ssn,1*/ BULK COLLECT INTO book_tbl1 FROM book_data;
  DBMS_OUTPUT.put_line(book_tbl1(1).book_name);
END;

Error report -
ORA-06550: line 11, column 75:
PL/SQL: ORA-00913: too many values
ORA-06550: line 11, column 3:
PL/SQL: SQL Statement ignored
06550. 00000 -  "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:

问题：这里我们将两列插入三列收集表然后我们应该得到“ORA-00947：没有足够的值”错误。但是我们得到“ORA-00913：太多的值”。为什么？

DECLARE
  TYPE book_rec is record(
    book_name  varchar2(50),
    book_price number,
    book_ssn   varchar2(50)
    );
  type book_tbl_type is table of book_rec;
  book_tbl1 book_tbl_type := book_tbl_type();
BEGIN

  SELECT BOOK_NAME, BOOK_PRICE,book_ssn,1 BULK COLLECT INTO book_tbl1 FROM book_data;
  DBMS_OUTPUT.put_line(book_tbl1(1).book_name);
END;

Error report -
ORA-06550: line 11, column 71:
PL/SQL: ORA-00947: not enough values
ORA-06550: line 11, column 3:
PL/SQL: SQL Statement ignored
06550. 00000 -  "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:

问题：这里我们将四列插入三列收集表中。然后我们得到“ORA-00913：太多的价值”错误。但我们得到的是“ORA-00947：没有足够的价值”。为什么？

Answer 1

ORA-00913太多的值了原因：SQL语句需要两组值相等的值。当第二组包含的项目多于第一组时，会发生此错误。例如，WHERE或HAVING子句中的子查询可能返回太多列，或者VALUES或SELECT子句可能返回的列数多于INSERT中列出的列数。操作：检查每个集中的项目数，并更改SQL语句以使它们相等。

在BULK COLLECT的情况下，似乎错误消息是指集合表中的列数，而不是所选列的数量。

为避免类似问题，您可以使用％ROWTYPE，类似：

DECLARE
  type book_tbl_type is table of book_data%ROWTYPE;
  book_tbl1 book_tbl_type := book_tbl_type();
BEGIN
  SELECT b.* BULK COLLECT INTO book_tbl1 FROM book_data b;
END;
/

BULK为ORA-00913＆amp;收集误导性错误消息ORA-00947

1 个答案: