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中國(guó)信保筆試題目
填空題
1、關(guān)系代數(shù)以集合代數(shù)為基礎(chǔ)運(yùn)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(kāi)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(shí)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(gè)關(guān)系上的約束
not null
unique
check
參照完整性
斷言
函數(shù)依賴
簡(jiǎn)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(kù)設(shè)計(jì)
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(guò)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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