text: -- @testpoint: 插入空值
  -- @modify at: 2020-11-17
  
  drop table if exists test_varchar2_07;
  create table test_varchar2_07 (id int,name varchar2(8));
  insert into test_varchar2_07 values (1,'');
  insert into test_varchar2_07 values (2,null);
  select * from test_varchar2_07;
  drop table test_varchar2_07;