oracle 与Mysql自增长主键的对比

=====================================================================下面是mysql的写法
-- 建立person表
CREATE TABLE personue
(
-- 生成一个流水号，观察显示的记录数
id int AUTO_INCREMENT NOT NULL PRIMARY KEY ,
-- 用户的登陆ID
userid varchar2(32) ,
-- 用户的真实姓名
name varchar2(32) ,
-- 用户的登陆密码

password varchar2(20) 

) ; 

-- 插入测试数据 

INSERT INTO personue(userid,name,password) VALUES ('LXH01','李兴华01','MLDN01') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH02','李兴华02','MLDN02') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH03','李兴华03','MLDN03') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH04','李兴华04','MLDN04') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH05','李兴华05','MLDN05') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH06','李兴华06','MLDN06') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH07','李兴华07','MLDN07') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH08','李兴华08','MLDN08') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH09','李兴华09','MLDN09') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH10','李兴华10','MLDN10') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH11','李兴华11','MLDN11') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH12','李兴华12','MLDN12') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH13','李兴华13','MLDN13') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH14','李兴华14','MLDN14') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH15','李兴华15','MLDN15') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH16','李兴华16','MLDN16') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH17','李兴华17','MLDN17') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH18','李兴华18','MLDN18') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH19','李兴华19','MLDN19') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH20','李兴华20','MLDN20') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH21','李兴华21','MLDN21') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH22','李兴华22','MLDN22') ; 

INSERT INTO personue(userid,name,password) VALUES ('LXH23','李兴华23','MLDN23') ;

================================================================================下面是oracle的写法

-- 建立person表
CREATE TABLE personue
(
-- 生成一个流水号，观察显示的记录数
id int PRIMARY KEY ,
-- 用户的登陆ID
userid varchar2(32) ,
-- 用户的真实姓名
name varchar2(32) ,
-- 用户的登陆密码
password varchar2(20)
) ;
--建立序列号
create sequence seq_personue;

-- 插入测试数据 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH01','李兴华01','MLDN01') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH02','李兴华02','MLDN02') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH03','李兴华03','MLDN03') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH04','李兴华04','MLDN04') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH05','李兴华05','MLDN05') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH06','李兴华06','MLDN06') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH07','李兴华07','MLDN07') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH08','李兴华08','MLDN08') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH09','李兴华09','MLDN09') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH10','李兴华10','MLDN10') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH11','李兴华11','MLDN11') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH12','李兴华12','MLDN12') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH13','李兴华13','MLDN13') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH14','李兴华14','MLDN14') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH15','李兴华15','MLDN15') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH16','李兴华16','MLDN16') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH17','李兴华17','MLDN17') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH18','李兴华18','MLDN18') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH19','李兴华19','MLDN19') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH20','李兴华20','MLDN20') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH21','李兴华21','MLDN21') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH22','李兴华22','MLDN22') ; 

INSERT INTO personue(id,userid,name,password) VALUES (seq_personue.nextval,'LXH23','李兴华23','MLDN23') ;

注意事项及解释说明：
create sequence seq_personue;
oracle是通过内建的序列号
来指定流水号的，而这个序列号是需要显示的插入