oracle pl/sql输入错误

代码：

DECLARE
 N NUMBER :=&N;
BEGIN
 DBMS_OUTPUT.PUT_LINE(N);
END;

SET serveroutput ON
SET define OFF
DECLARE
  N NUMBER :=&N;
BEGIN
  DBMS_OUTPUT.PUT_LINE(N);
END;
/

Error starting at line : 8 in command -
DECLARE
  N NUMBER :=&N;
BEGIN
  DBMS_OUTPUT.PUT_LINE(N);
END;
Error report -
ORA-06550: line 2, column 14:
PLS-00103: Encountered the symbol "&" when expecting one of the following:

   ( - + case mod new not null <an identifier>
   <a double-quoted delimited-identifier> <a bind variable>
   continue avg count current exists max min prior sql stddev
   sum variance execute forall merge time timestamp interval
   date <a string literal with character set specification>
   <a number> <a single-quoted SQL string> pipe
   <an alternatively-quoted string literal with character set specification>
   <an alternatively
06550. 00000 -  "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:

错误：

DECLARE
 N NUMBER :=&N;
BEGIN
 DBMS_OUTPUT.PUT_LINE(N);
END;

SET serveroutput ON
SET define OFF
DECLARE
  N NUMBER :=&N;
BEGIN
  DBMS_OUTPUT.PUT_LINE(N);
END;
/

Error starting at line : 8 in command -
DECLARE
  N NUMBER :=&N;
BEGIN
  DBMS_OUTPUT.PUT_LINE(N);
END;
Error report -
ORA-06550: line 2, column 14:
PLS-00103: Encountered the symbol "&" when expecting one of the following:

   ( - + case mod new not null <an identifier>
   <a double-quoted delimited-identifier> <a bind variable>
   continue avg count current exists max min prior sql stddev
   sum variance execute forall merge time timestamp interval
   date <a string literal with character set specification>
   <a number> <a single-quoted SQL string> pipe
   <an alternatively-quoted string literal with character set specification>
   <an alternatively
06550. 00000 -  "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:

ORA-06550:第2行第12列：PLS-00103:遇到符号“&” 当预期出现以下情况之一时：

（+case mod new not null continue avg count current） 存在执行所有合并之前的最大最小sql STDEV和方差 时间戳间隔日期管道 您需要执行以下操作：

SET DEFINE ON

我认为您使用的是类似于sqldeveloper的GUI客户机，并且您没有define on。

&

用于替换变量

在SQL开发者中：

DECLARE
 N NUMBER :=&N;
BEGIN
 DBMS_OUTPUT.PUT_LINE(N);
END;

SET serveroutput ON
SET define OFF
DECLARE
  N NUMBER :=&N;
BEGIN
  DBMS_OUTPUT.PUT_LINE(N);
END;
/

Error starting at line : 8 in command -
DECLARE
  N NUMBER :=&N;
BEGIN
  DBMS_OUTPUT.PUT_LINE(N);
END;
Error report -
ORA-06550: line 2, column 14:
PLS-00103: Encountered the symbol "&" when expecting one of the following:

   ( - + case mod new not null <an identifier>
   <a double-quoted delimited-identifier> <a bind variable>
   continue avg count current exists max min prior sql stddev
   sum variance execute forall merge time timestamp interval
   date <a string literal with character set specification>
   <a number> <a single-quoted SQL string> pipe
   <an alternatively-quoted string literal with character set specification>
   <an alternatively
06550. 00000 -  "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:

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