oracle基础操作

--2013-19

create tablespace myspace

datafile 'c:\muyspace.dbf' size 10 M autoextend on;

alter tablespace myspace add datafile 'c:\muyspace2.dbf' size 10M autoextend on;

--新建一个用户

CREATE USER cssp

IDENTIFIED BY cssp1234

DEFAULT TABLESPACE USERS

TEMPORARY TABLESPACE TEMP;

select * from dba_users;

select * from dba_users where username='cssp';

grant connect to cssp;

grant resource to cssp;

grant create sequence to cssp;

alter user cssp quota unlimited on users;

grant select on test to cssp;

grant update on test to cssp;

grant all on test to cssp;

--2013-01-20

--第二天

select sysdate from dual; --当前系统时间

 

--学生信息表

create table cssp.students

(

 studentsID number primary key,

 SNme char(10) not null,

 SAddress varchar(50),

 SGrade float,

 SEmail varchar(50),

 SSex number

);

 

 

--插入学生信息表

insert into cssp.students values(1,'张三','湖南长沙',3,'zhangsan@cssp.com',1);

insert into cssp.students values(2,'李四','湖南浏阳',3,'lisi@cssp.com',0);

insert into cssp.students values(3,'王五','湖南湘西',3,'wangwu@cssp.com',1);

insert into cssp.students values(4,'赵六','湖南邵阳',3,'zhaoliu@cssp.com',0);

 

 --查询表信息

 select * from cssp.students;

 

 

 --科目表

 create table cssp.course

 (

    courseid int primary key,

    coursename varchar(50)

 );

 

 

 --科目表插入

insert into cssp.course values(1,'语文');

insert into cssp.course values(2,'数学');

insert into cssp.course values(3,'英语');

 select * from cssp.course;

 

 --成绩表

 create table cssp.scoure

(

    scoureid number primary key,      --主键

    studentid number not null,        --学号

    courseid number,                  --科目

    scoure number            

   

 ); 

 --成绩插入

 --语文

insert into cssp.scoure values(1,1,1,80);

insert into cssp.scoure values(2,2,1,70);

insert into cssp.scoure values(3,3,1,60);

insert into cssp.scoure values(4,4,1,56);

--补考

insert into cssp.scoure values(13,4,1,12);

 

 --成绩插入

 --数学

insert into cssp.scoure values(5,1,2,70);

insert into cssp.scoure values(6,2,2,90);

insert into cssp.scoure values(7,3,2,40);

insert into cssp.scoure values(8,4,2,36);

--成绩插入

 --英语

insert into cssp.scoure values(9,1,3,67);

insert into cssp.scoure values(10,2,3,50);

insert into cssp.scoure values(11,3,3,70);

insert into cssp.scoure values(12,4,3,86);

--更新数据

update cssp.scoure set scoure=40 where scoureid=7;

 

 

--删除数据

delete cssp.scoure where scoure=40;

select * from cssp.scoure;

--加外键约束

alter table cssp.scoure

add constraint fk_student_id

foreign key(studentid)

references cssp.students;

 

 

alter table cssp.scoure

add constraint fk_course_id

foreign key(courseid)

references cssp.course;

 

--伪列

select a.* ,rowid,rownum from cssp.students a;

--查询前两笔数据

select * from cssp.students where rownum <=3;

--利用现表建新表

create table cssp.students_new

as

select * from cssp.students;

select * from cssp.students_new;

--复制表结构

create table cssp.students_new

as

select * from cssp.students where 1=2;

--删除表

drop table cssp.students_new;

 

 

--2013-22

--去重

select  distinct studentid from cssp.scoure where courseid=1;

--不去重

select  studentid from cssp.scoure where courseid=1;

--别名

select  studentid as 学号, sname as 姓名 from cssp.students;

select * from cssp.students;

--增加日期字段

alter table cssp.students add birthday date;

--默认日期格式

insert into cssp.students(studentid,sname,birthday) values(5,'老七','1-1月-91');

--TO_DATE函数

insert into cssp.students(studentid,sname,birthday)

values(6,'老八',to_date('1992-01-11','YYYY-MM-DD'));

--不转换 报错:文件与格式字符串不匹配。

insert into cssp.students(studentid,sname,birthday)

values(6,'老八','1992-01-11')

select * from CSSP.students;

--从现有的表中提取数据

--新建一个表

create table scoure_new as

select* from  cssp.scoure where 1=2;

--提取科目1的成绩插入到scoure_new中

insert into scoure_new

select* from  cssp.scoure

where courseid=1;

select * from CSSP.scoure;

select * from scoure_new;

--事务控制

savepoint make1; --回滚点1

delete from cssp.students where studentid=5;

savepoint make2 ;--回滚点2

delete from cssp.students where studentid=6;

rollback to savepoint make2;--回滚

commit;               --提交

 

select * from CSSP.students;

--执行算数操作符+ - * /

--新建一个表

create table test(

a int,

b int

);

--插入数据

insert into test values(20,50);

insert into test values(10,50);

select * from test;

--列

select a.*,a+b,a-b,A*B,A/B FROM test a;

--常量

select a.*,a+100,a-50,A*12,A/10 FROM test a;

--比较操作符

--..省略

--逻辑操作符

--..省略 自己去看看啊