Oracle 저장 프로시저에서 변수에 값을 할당하는 방법은 무엇입니까?

V_START_DATE VARCHAR2(19);
v_num number;

--错误用法
BEGIN
v_sql varchar2(100) := 'SELECT ORGSEQ FROM BASE_ORG_INFO where orgcode=to_char(410621101233)';

V_ORGSEQ BASE_ORG_INFO.ORGSEQ%TYPE;

--VIRTUAL_CARD表整行数据
V_ROW_VIRTUAL_CARD VIRTUAL_CARD%ROWTYPE;　

V_ORGID :=  '110';　　

--错误用法
V_ORGSEQ := SELECT ORGSEQ INTO V_ORGSEQ FROM BASE_ORG_INFO;
--正确用法
V_ORGSEQ := 'SELECT ORGSEQ INTO V_ORGSEQ FROM BASE_ORG_INFO';

--正确用法
v_sql varchar2(100) := 'SELECT ORGSEQ FROM BASE_ORG_INFO where orgcode=to_char(410621101233)';
BEGIN
 /* 具体业务 */
END;

--根据医疗机构ID查询对应的父机构的机构序列
SELECT ORGSEQ INTO V_ORGSEQ FROM BASE_ORG_INFO
 WHERE ORGID =
       (SELECT PARENTORGID FROM BASE_ORG_INFO WHERE ORGID = V_ORGID);

--将id=5120的VIRTUAL_CARD表数据赋值给变量V_ROW_VIRTUAL_CARD
SELECT * INTO V_ROW_VIRTUAL_CARD FROM VIRTUAL_CARD T where t.id = 5120;

--错误举例一：查询的是所有表记录
SELECT * INTO V_ROW_VIRTUAL_CARD FROM VIRTUAL_CARD T;
--错误举例二：查询的是该表的多个字段
SELECT t.id,t.name INTO V_ROW_VIRTUAL_CARD FROM VIRTUAL_CARD T;　　

declare/* 存储过程，不需要声明 */
  v_sql varchar2(100);
  V_ORGSEQ varchar2(100);
begin
  v_sql := 'SELECT ORGSEQ FROM BASE_ORG_INFO where orgcode=to_char(410621101233)';
  --V_ORGSEQ赋值
  execute immediate v_sql INTO V_ORGSEQ;
  --打印结果
  DBMS_OUTPUT.put_line(V_ORGSEQ);
END;

--错误调用
select V_ORGSEQ from dual;

--V_ROW_VIRTUAL_CARD赋值
SELECT * INTO V_ROW_VIRTUAL_CARD FROM VIRTUAL_CARD T where t.id = 5120;
--调用
DBMS_OUTPUT.put_line(V_ROW_VIRTUAL_CARD.ID);