ORACLEAL TERTABLE

create table T_CLASS_INFO(

CLASSNO number(3) primary key, --班级序号

CLASSNAME varchar2(10),

CLASSPLACE varchar2(13)

);

create table T_STUDENT_INFO(

STUNO number(3),--学号

CLASSNO number(3),

STUNAME varchar2(10),

STUSEX char(1),

STUCONTECT number(11), --联系方式

STUADD varchar2(50),

STUDETAILINFO varchar2(100)

);

--修改列名

ALTER table T_CLASS_INFO RENAME column CLASSPLACE to LOCATION;

--添加主键约束

ALTER table T_STUDENT_INFO ADD constraint PK_STU_NO primary key(STUNO);

--添加外键约束

ALTER table T_STUDENT_INFO ADD constraint FK_CLASSNO foreign key(CLASSNO) references T_CLASS_INFO(CLASSNO);

--添加check约束

ALTER table T_STUDENT_INFO ADD constraint CK_STU_INFO check (STUSEX in ('F','M'));

--添加not null约束

ALTER table T_STUDENT_INFO MODIFY STUCONTECT constraint NOT_NULL_INFO not null;

--添加unique约束

ALTER table T_STUDENT_INFO ADD constraint UQ_STU_CONTECT unique(STUCONTECT);

--添加default约束

ALTER table T_STUDENT_INFO MODIFY STUSEX char(2) default'M';

--增加列

ALTER table T_STUDENT_INFO ADD STUID varchar2(18);

ALTER table T_STUDENT_INFO ADD STUAGE DATE default sysdate not null;

--删除列

ALTER table T_STUDENT_INFO DROP column STUDETAILINFO;

--修改列的长度

ALTER table T_CLASS_INFO MODIFY CLASSPLACE varchar2(50);

--修改列的精度

ALTER table T_STUDENT_INFO MODIFY STUNO number(2);

--修改列的数据类型

ALTER table T_STUDENT_INFO MODIFY STUSEX char(2);

--修改列的默认值

ALTER table T_STUDENT_INFO MODIFY STUAGE default sysdate+1;

--禁用约束

ALTER table T_STUDENT_INFO disable FK_CLASSNO;

--启用约束

ALTER table T_STUDENT_INFO enable FK_CLASSNO;

--删除约束

ALTER table T_STUDENT_INFO DROP FK_CLASSNO;

--延迟约束

ALTER table T_STUDENT_INFO ADD constraint FK_CLASSNO foreign key(CLASSNO)

references T_CLASS_INFO(CLASSNO)

deferrable initially deferred;

--向表中添加注释

comment on table T_STUDENT_INFO is '学生表';

--向列添加注释

comment on column T_STUDENT_INFO.STUNAME is '学生姓名';

comment on column T_CLASS_INFO.CLASSNAME is '班级';

--清除表中所有数据

truncate table T_STUDENT_INFO;

--删除表

DROP table T_STUDENT_INFO;

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ORACLEAL TERTABLE create table T_CLASS_INFO(CLASSNO number(3) primary key, --班级序号CLASSNAME varchar2(10),CLASSPLACE varchar2(13));create table T_STUDENT_INFO(STUNO number(3),--学号CLASSNO number(3),STUNAME varchar2(10),STUSEX char(...

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