Oracle command to create a primary key foreign key

Oracle command to create a primary key foreign key 1. create a student table [SQL] SQL> create table t_stu (2 stuid number (10) primary key, 3 stuname varchar2 (20) not null, 4 stusex varchar2 (2) default 'male' check (stusex in ('male', 'female '))); table created Executed in 0.547 seconds 2. create a curriculum [SQL] SQL> create table t_couse (2 couseid number (10) primary key, 3 cousename varchar2 (20) not null, 4 cousetype varchar2 (4); www.2cto.com Table created Executed in 0.062 seconds 3. Create a student course quota Table (including the primary and Foreign keys) [SQL] SQL> create table t_score (2 scoreid number (10) primary key, 3 stuid number (10) references t_stu (stuid), 4 couseid number (10 ), 5 constraint fk_couseid foreign key (couseid) 6 references t_couse (couseid) 7 on delete cascade); Table created