Oracle基礎 建表語句（DDL）

1.建立表

語法：create table table_name(

filed_name datatype not null,

filed_name datatype not null,

filed_name datatype,

filed_name datatype not null,

constraint pk_name primary key (filed_name)

using index tablespace tablespace_name1

)tablespace tablespace_name2;

comment on table table_name is 'comment';

comment on column table_name.filed_name is 'comment';

comment on column table_name.filed_name is 'comment';

comment on column table_name.filed_name is 'comment';

comment on column table_name.filed_name is 'comment';

示例：--1.建表

--學生表

create table student(

student_id number(12) not null,

stu_name varchar2(255) not null,

age number(6),

*** char(1) not null,

constraint pk_student primary key (student_id)

using index tablespace idx_cc

)tablespace tab_cc;

comment on table student is '學生表';

comment on column student.student_id is '學生標識';

comment on column student.stu_name is '學生姓名';

comment on column student.age is '學生年齡';

comment on column student.*** is '學生性別';

commit;

--課程表

create table course(

course_id number(12) not null,

course_name varchar2(255) not null,

constraint pk_course primary key (course_id)

using index tablespace idx_cc

)tablespace tab_cc;

comment on table course is '課程';

comment on column course.course_id is '課程標識';

comment on column course.course_name is '課程名稱';

commit;

--學生課程表

create table stu_course(

student_id number(12) not null,

course_id number(12) not null,

constraint pk_stu_course primary key (student_id,course_id)

using index tablespace idx_cc

)tablespace tab_cc;

comment on table stu_course is '學生課程表';

comment on column stu_course.student_id is '學生標識';

comment on column stu_course.course_id is '課程標識';

commit;

alter table stu_course add

constraint fk_stu_course_student foreign key (student_id) 

references student(student_id);

alter table stu_course add 

constraint fk_stu_course_course foreign key(course_id)

references course(course_id);

commit;

2.刪除表

語法：drop table table_name;

示例：drop table student;

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