Oracle基础-建表语句（DDL）

1.创建表

语法：

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

--学生表

CREATE TABLE STUDENT(

STUDENT_ID NUMBER(12) NOT NULL,

STU_NAME VARCHAR2(255) NOT NULL,

AGE NUMBER(6),

SEX CHAR(1) NOT NULL,

CONSTRAINT PK_STUDENT PRIMARY KEY (STUDENT_ID)

using index tablespace IDX_CC

)

tablespace TAB_CC;

comment on table student is '学生表';

comment on COLUMN student.student_id is '学生标识';

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

comment on column student.age is '学生年龄';

comment on column student.sex is '学生性别';

commit;

--课程表

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 '课程';

COMMENT ON COLUMN course.course_id IS '课程标识';

COMMENT ON COLUMN course.course_name IS '课程名称';

COMMIT;

--学生课程表

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 '学生课程表';

COMMENT ON COLUMN stu_course.student_id IS '学生标识';

COMMENT ON COLUMN stu_course.course_id IS '课程标识';

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.删除表

语法：

DROP TABLE TABLE_NAME;

示例：

DROP TABLE STUDENT;