text: -- @testpoint: drop table与if exists 结合
  drop table if exists alter_table_tb03;
  create table alter_table_tb03
  (
  c1 int,
  c2 bigint,
  c3 varchar(20)
  );
  insert into alter_table_tb03 values('11',null,'sss');
  insert into alter_table_tb03 values('21','','sss');
  insert into alter_table_tb03 values('31',66,'');
  insert into alter_table_tb03 values('41',66,null);
  insert into alter_table_tb03 values('41',66,null);
  
  drop table if exists alter_table_tb03;
  
  