由于 PLS-00049 创建了带有编译错误的触发器：绑定变量错误答案

【问题标题】：Trigger created with compilation errors due to PLS-00049: bad bind variable由于 PLS-00049 创建了带有编译错误的触发器：绑定变量错误
【发布时间】：2019-05-05 16:59:41
【问题描述】：

我编写了下面的代码来测试对 emp 表的审计。但不知道为什么会出现错误 PLS-00049: bad bind variable

create table audit_emp_values (Username varchar2(30), Time timestamp, old_salary number, new_salary number);

CREATE OR REPLACE TRIGGER audit_emp_values
AFTER delete or update or insert on employee
FOR EACH ROW
Begin
     insert into audit_employee_table values (user, sysdate, :old.old_salary, :new.new_salary);
End;
/
Warning: Trigger created with compilation errors.

SQL> show err;
Errors for TRIGGER AUDIT_EMP_VALUES:

LINE/COL ERROR
-------- -----------------------------------------------------------------
2/58     PLS-00049: bad bind variable 'OLD.OLD_SALARY'
2/75     PLS-00049: bad bind variable 'NEW.NEW_SALARY'

【问题讨论】：

员工表中是否有 old_salary 和 new_salary 列？
请给您的员工表定义@Nav
可能是你的员工表中的工资列

标签： plsql

【解决方案1】：

我能够解决错误。下面是正确的代码。

create table audit_employee_table (Username varchar2(30), Time timestamp, old_salary number, new_salary number);

CREATE OR REPLACE TRIGGER audit_emp_values
AFTER delete or update or insert on employee
FOR EACH ROW
Begin
     insert into audit_employee_table values (user, sysdate, :OLD.salary, :NEW.salary);
End;
/

【讨论】：