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标题: oracle添加主键的四种方法 [打印本页]

作者: fteair 时间: 2020-2-5 17:49

作者: 张兴康 时间: 2020-2-7 14:00

作者: 张兴康 时间: 2020-7-26 14:33
标题: oracle添加主键的四种方法

racle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 primarykey,

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 studentsvalues(0001,'zhangsan','shanghai');

insert into studentsvalues(0002,'lisi','beijing');

insert into studentsvalues(0003,'wangwu','guangzhou');

create table course

(id number,

code number,

name varchar2(10),

subject varchar2(30)

);

alter table course add constraint pk_co_idprimary key ( id);

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

alter table students add foreign key pk_co_id onid;

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

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

作者: 张兴康 时间: 2020-7-26 14:33

作者: fteair 时间: 2020-7-26 17:37

作者: fteair 时间: 2020-7-27 17:43

作者: 张兴康 时间: 2020-7-28 17:28

作者: fteair 时间: 2020-7-28 17:42

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