CASE 测试变量
    WHEN  目标1  THEN
        ...
    WHEN  目标2   THEN
        ...
END  CASE ;

set serverout on
declare
  v_name varchar2(20):=‘&name‘;
begin
  case v_name
    when ‘a‘ then
       dbms_output.put_line(‘输入的是a‘);
    when ‘b‘ then
       dbms_output.put_line(‘输入的是b‘);
  end case;
end;
/