oracle添加主键的四种方法:

列级，表级建立主键

drop table constraint_test;

1.create table constraint_test

( name_id number not null constraint cons_name_id primary key,

old number )

2.create table constraint_test

( name_id number  primary key,

old number )

drop table constraint_test;

3.create table constraint_test

(

name_id number not null,

old number  ,

constraint cons_name_id primary key ( name_id )

);

drop table constraint_test;

4.create table constraint_test

(

name_id number not null,

old number

);

alter table constraint_test add constraint cons_name_id primary key ( name_id );

外键

drop table course ;

drop table students ;

create table students

(code number  ,

name varchar2(10),

country varchar2(30)

);

alter table students add constraint pk_st_cod primary key ( code);

insert into students values(0001,'zhangsan','shanghai');

insert into students values(0002,'lisi','beijing');

insert into students values(0003,'wangwu','guangzhou');

create table course

(id number,

code  number,

name varchar2(10),

subject varchar2(30)

);

alter table course  add constraint pk_co_id primary key ( id);

alter table course  add constraint fk_co_st foreign key ( code) references  students(code);

alter table students add foreign key pk_co_id on id;

inser into course(id,code,name,subject) values(1,001,'zhangsan','yuwen');

inser into course(id,code,name,subject) values(2,001,'zhangsan','shuxue');

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