尝试在Oracle中创建表类型时出现错误PLS-00201

CREATE OR REPLACE TYPE employee_type AS TABLE OF employee;

GRANT CREATE TYPE TO username;

CREATE OR REPLACE TYPE employee_type AS TABLE OF employee;

-- 创建一个表类型
CREATE OR REPLACE TYPE employee_type AS TABLE OF employee;

-- 使用表类型
DECLARE
    emp_list employee_type;
BEGIN
    -- 插入数据到表类型
    emp_list := employee_type(employee('John Doe', 101), employee('Jane Smith', 102));
    
    -- 处理表类型数据
    FOR i IN 1..emp_list.COUNT LOOP
        DBMS_OUTPUT.PUT_LINE(emp_list(i).name || ' - ' || emp_list(i).id);
    END LOOP;
END;
/