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参考文献
http://blog.csdn.net/andyelvis/article/details/2446865
1、把主键定义为自动增长标识符类型
MySql
在mysql中,如果把表的主键设为auto_increment类型,数据库就会自动为主键赋值。例如:
create table customers(id int auto_increment primary key not null, name varchar(15));insert into customers(name) values("name1"),("name2");select id from customers;
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