该练习为Jdbc中继承关系实例Account的完整实现，建表和实体类之间比较完整的体现了一张超级大表的优势和不足。- create table bams_account( id number(7) primary key, name varchar2(15) not null, password varchar2(15) not null, cardid varchar2(15) not null unique, balance number(10,2) ,

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