建表(一對多)代碼及相關約束

create table t_class(

c_id number(3) primary key,

c_name varchar2(20) not null

);

create table t_stu(

s_id number(5) primary key,

s_name varchar2(8) not null,

sex char(2) default '男',

birthday date,

school_age number(2) check(school_age>0),

school_score number(5,2),

c_id number(3),

id_card char(18) unique,

foreign key(c_id) references t_class(c_id)

);

附：測試數據：

insert into t_class values(1,'訂單班');

insert into t_class values(2,'開發班');

insert into t_class values(3,'美工班');

insert into T_STU (S_ID, S_NAME, SEX, BIRTHDAY, SCHOOL_AGE, SCHOOL_SCORE, C_ID, ID_CARD)

values (1, 'a', '男', to_date('01-01-1980', 'dd-mm-yyyy'), 24, 90, 1, null);

insert into T_STU (S_ID, S_NAME, SEX, BIRTHDAY, SCHOOL_AGE, SCHOOL_SCORE, C_ID, ID_CARD)

values (2, 'b', '男', to_date('11-05-1981', 'dd-mm-yyyy'), 23, 80, 1, null);

insert into T_STU (S_ID, S_NAME, SEX, BIRTHDAY, SCHOOL_AGE, SCHOOL_SCORE, C_ID, ID_CARD)

values (3, 'c', '女', to_date('19-09-1982', 'dd-mm-yyyy'), 22, 50, 1, null);

insert into T_STU (S_ID, S_NAME, SEX, BIRTHDAY, SCHOOL_AGE, SCHOOL_SCORE, C_ID, ID_CARD)

values (4, 'd', '女', to_date('28-01-1984', 'dd-mm-yyyy'), 21, 80, 2, null);

insert into T_STU (S_ID, S_NAME, SEX, BIRTHDAY, SCHOOL_AGE, SCHOOL_SCORE, C_ID, ID_CARD)

總結

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