sql - 甲骨文基本问题

Question

我是 oracle 的新手。当我使用以下方法创建存储过程时:

CREATE OR REPLACE PROCEDURE PROCEDURE1 
AS
BEGIN

  SELECT FIRSTNAME,
         LASTNAME
    INTO FirstName,LastName
    FROM EMPLOYEE;

END PROCEDURE1;

我收到以下错误:

PL/SQL Statement Ignored Identifier FIRSTNAME must be declared ORA-00904 Invalid identifier

Answer 1

在尝试填充变量之前，您需要声明变量:

CREATE OR REPLACE PROCEDURE PROCEDURE1 
AS

 FirstName EMPLOYEE.FIRSTNAME%TYPE;
 LastName EMPLOYEE.LASTNAME%TYPE;

BEGIN

  SELECT FIRSTNAME,
         LASTNAME
    INTO FirstName,LastName
    FROM EMPLOYEE;

END PROCEDURE1;

%TYPE 表示法是与列数据类型匹配的数据类型声明的简写。如果该数据类型发生变化，则无需更新该过程。