中國信保應(yīng)聘筆試題目
填空題
1、關(guān)系代數(shù)以集合代數(shù)為基礎(chǔ)運算，基本操作是并、差、笛卡兒積、投影和選擇。規(guī)范化理論
中分解關(guān)系模式主要是消除多余的數(shù)據(jù)相關(guān)性。
2、數(shù)字簽名常用公開密鑰加密方法。發(fā)送者簽名使用的'密鑰為發(fā)送者的公鑰，
常用的加密算法有 Hash 簽名、DSS 簽名、RSA 簽名。
3、Internet 實現(xiàn)組播，傳輸層協(xié)議為組播地址解析協(xié)議(MARS：Multicast Address Resolution Server)
4、完整性約束:
單個關(guān)系上的約束
not null
unique
check
參照完整性
斷言
函數(shù)依賴
簡答題
MVC 模式及其作用，列出至少兩種目前流行的 MVC 組件。
六、數(shù)據(jù)庫設(shè)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、插入數(shù)據(jù)
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(shù)超過3人的公司名稱和總?cè)藬?shù)查出，按人數(shù)降序排列;
select companyName, sum(numberHired) as sum
from Company c, EmployeeHired e
where c.id = e.id and FiscalYear = 2008
group by e.id, companyName
having sum(numberHired) > 3
order by sum desc;
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