--刪除員工表
drop table db_user;
--刪除角色表
drop table db_role;
--清空**站（recycle bin）
purge recyclebin;
--建立角色資訊表
create table db_role(
roleid varchar2(8) not null primary key,
rolename varchar2(10)
);--建立員工資訊表
create table db_user(
id varchar2(8) not null primary key,
name varchar2(10),
age number(4),
*** varchar2(4),
phone varchar2(13),
city varchar2(16),
roleid varchar2(8),
foreign key(roleid) references db_role(roleid)
);--向角色表中插入資料
insert into db_role values('2013101','普通管理員');
insert into db_role values('2013102','部門經理');
insert into db_role values('2013103','顧問');
insert into db_role values('2013104','超級使用者');
--提交
commit;
--向使用者表插入資料
insert into db_user(id,name,age,***,phone,city,roleid) values('20131001','王鶴',28,'男','1582342342','北京','2013101');
insert into db_user(id,name,age,***,phone,city,roleid) values('20131002','李崇',24,'男','1582342342','深圳','2013102');
insert into db_user(id,name,age,***,phone,city,roleid) values('20131003','郭玉',26,'女','1582342342','上海','2013103');
insert into db_user(id,name,age,***,phone,city,roleid) values('20131004','張赫',22,'男','1582342342','北京','2013101');
insert into db_user(id,name,age,***,phone,city) values('20131005','李文婷',27,'女','1582342342','上海');
insert into db_user(id,name,age,***,phone,city,roleid) values('20131006','李峰',23,'男','1582342342','北京','2013102');
insert into db_user(id,name,age,***,phone,city,roleid) values('20131007','海濤',25,'男','1582342342','長沙','2013101');
commit;
--查詢
select * from db_user where ***='男';
select id,name, age from db_user;
select * from db_user where age<24;
select * from db_user where city='北京';
select * from db_user where id='20131002';
select * from db_user where ***='男' and age<24;
select * from db_user where ***='男' or age<24;
--修改資料
update db_user set name='李易峰';
commit;
update db_user set name='李易小峰',age=26,phone='12345667' where id='20131006';
commit;
select * from db_user;
--刪除
delete from db_user where ***='女';
select * from db_user;
delete from db_user;
commit;
select * from db_user;
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