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計(jì)算機(jī)三級《數(shù)據(jù)庫技術(shù)》考前模擬題和答案
計(jì)算機(jī)三級考試備考工作已經(jīng)進(jìn)入緊張沖刺階段，不知道同學(xué)們都復(fù)習(xí)得怎么樣呢?以下是編搜索整理的一份計(jì)算機(jī)三級《數(shù)據(jù)庫技術(shù)》考前模擬題和答案，供參考練習(xí)，預(yù)�？忌鷤兛汲鲎约豪硐氲某煽�!
1.假定學(xué)生關(guān)系是S(S#，SNAME，SEX，AGE)，課程關(guān)系是C(C#，CNAME，TEACHER)，學(xué)生選課關(guān)系是SC(S#，C#，GRADE)。要查找選修 "COMPUTER"課程的"女"學(xué)生姓名，將涉及到關(guān)系(d )
A.S
B.SC， C
C.S，SC
D.S，C，SC
2.SQL語言中，實(shí)現(xiàn)數(shù)據(jù)檢索的語句是(a )
A.SELECT
B.INDERT
C.UPDATE
D.DELETE
3.下列SQL語句中，修改表結(jié)構(gòu)的是(a )
A.ALTER
B.CREATE
C.UPDATE
D.INSERT
4.SQL語言具有兩種使用方式，分別稱為交互式SQL和(c )
A.提示式SQL
B.多用戶SQL
C.嵌入式SQL
D.解釋式SQL
5.檢索所有比 "王華"年齡大的學(xué)生姓名、年齡和性別。正確的SELECT語句是(a )
A.SELECT SN，AGE，SEX FROM S
SHERE AGE > (SELECT AGE FROM S)
WHERE SN=’王華’)
B.SELECT SN，AGE，SEX
FROM S
WHERE SN=’王華’
C.SELECT SN，ACE，SEX FROM S
WHERE AGE >(SELECT ACE
WHERE SN=’王華’)
D.SELECT SN，ACE，SEX FROM S
WHERE ACE >王華 AGE
6.檢索選修課程"C2"的學(xué)生中成績最高的學(xué)生的學(xué)號。正確的SeLECT的語句是(d )
A.SELECT S# FORM SC
WHERE C#= "C2" AND GRADE> =(SELECT GRADE FORM SC)
WHERE C#= "C2")
B.SELECT S#FORM SC
WHERE C#= "C2" AND GRADE IN(SELECT CRADE FORM SC)
WHERE C#= "C2"
C.SELECT S# FORM SC
WHERE C#= "C2" AND GRADE NOT IN(SELECT GRADE FORM SC
WHERE C#= "C2"
D.SELECT S# FORM SC
WHERE C#= "C2" AND CRANDE> =ALL(SELECT GRADE FORM SC
WHERE C#= "C2")
7.檢索學(xué)生姓名及其所選修課程的課程號和成績。正確的SELECT語句是( C)
A.SELECT S.SN，SC.C#，SC.CRADE
FROMS
WHERE S.S#=SC.S#
B.SELCECT S.SN，SC.C#，SC.GRADE
FROM SC
WHERE S.S#=S
C.CRADEC.SELECT S.SN，SC.C#，SC.CRADE
FROM S，SC
WHERE S.S#：S C.S#
D.SELSECT S.SN，SC.C#，SC.GRADE
FROM S，SC
8.檢索選修四門以上課程的學(xué)生總成績(不統(tǒng)計(jì)不及格的課程)，并要求按總成績的降序捧列出來。正確的SElECT語句是( B)
A.SELECT S#，SUM(GRADE)FROM SC
WHERE GRADE >=60
CROUP BY S#
ORDER BY 2 DESC
HAVING COUNT(*) >=4
B.SELECT S#，SUM(GRADE)FROM SC
WHERE GRADE >=60
GROUP BY S#
HAVING COUNT(*) >=4
ORDER BY 2 DESC
C.SELECT S#，SUM(GRADE)FROM SC
WHERE GRADE >=60
HAVINC COUNT(*) >=4
GROUP BY S#
ORDER BY 2 DESC
D.DELECT S#，SUM(GRADE)FROM SC
WHERE GRADE >=60
ORDER BY 2 DESC
CROUP BY S#
HAVINC COUNT(*) >=4
9.若用如下的SQL語句創(chuàng)建一個(gè)student表：
CREATE TABLE student NO C(4)NOT NULL，
NAME C(8)NOT NULL，
SEX C(2)，
AGE N(2)
可以插入到student表中的是(b )
A.(’1031’，’曾華’，男，23)
B.(’1031’，’曾華’，NULL，NULL)
C.(NULL，’曾華’，’男’，’23’)
D.(’1031’,NULL，’男’，23)
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