填空題
1、關係代數以集合代數為基礎運算，基本操作是並、差、笛卡兒積、投影和選擇。規範化理論
中分解關係模式主要是消除多餘的資料相關性。
2、數字簽名常用公開金鑰加密方法。傳送者簽名使用的金鑰為傳送者的'公鑰，
常用的加密演算法有 Hash 簽名、DSS 簽名、RSA 簽名。
3、Internet 實現組播，傳輸層協議為組播地址解析協議(MARS：Multicast Address Resolution Server)
4、完整性約束:
單個關係上的約束
not null
unique
check
參照完整性
斷言
函式依賴
簡答題
MVC 模式及其作用，列出至少兩種目前流行的 MVC 元件。
六、資料庫設計
1、建表
create table Company(companyName varchar2(30), id number(4) primary key);
create table EmployeeHired(id number(4), numberHired number(4),
FiscalYear number(4), FiscalQuarter number(4),
foreign key(id) references Company(id),
primary key(id, FiscalYear, FiscalQuarter));
2、插入資料
insert into Company values('Microsoft', 1);
insert into Company values('IBM', 2);
insert into Company values('HP', 3);
insert into Company values('Nortel', 4);
insert into EmployeeHired values(1, 1, 2007, 1);
insert into EmployeeHired values(1, 3, 2007, 3);
insert into EmployeeHired values(1, 3, 2008, 2);
insert into EmployeeHired values(2, 2, 2007, 2);
insert into EmployeeHired values(2, 4, 2007, 4);
insert into EmployeeHired values(2, 2, 2008, 1);
insert into EmployeeHired values(3, 5, 2008, 1);
insert into EmployeeHired values(3, 10, 2008, 2);
insert into EmployeeHired values(4, 3, 2008, 3);
insert into EmployeeHired values(4, 6, 2008, 4);
3、在表 Company 中加入一列 Address varchar2(40);
alter table Company
add Address varchar2(40);
4、將2008年招員工人數超過3人的公司名稱和總人數查出，按人數降序排列;
select companyName, sum(numberHired) as sum
from Company c, EmployeeHired e
where = and FiscalYear = 2008
group by , companyName
having sum(numberHired) > 3
order by sum desc;