2017計(jì)算機(jī)等考三級(jí)數(shù)據(jù)庫(kù)模擬練習(xí)題
2017下半年計(jì)算機(jī)等級(jí)考試時(shí)間9月23日-26日,同學(xué)們?cè)趶?fù)習(xí)過(guò)程中,練習(xí)題更是不可忽視的一部分,以下是百分網(wǎng)小編搜索整理的一份2017計(jì)算機(jī)等考三級(jí)數(shù)據(jù)庫(kù)模擬練習(xí)題,供參考練習(xí),希望對(duì)大家有所幫助!
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(yǔ)言中,實(shí)現(xiàn)數(shù)據(jù)檢索的語(yǔ)句是(a )
A.SELECT
B.INDERT
C.UPDATE
D.DELETE
3.下列SQL語(yǔ)句中,修改表結(jié)構(gòu)的是(a )
A.ALTER
B.CREATE
C.UPDATE
D.INSERT
4.SQL語(yǔ)言具有兩種使用方式,分別稱(chēng)為交互式SQL和(c )
A.提示式SQL
B.多用戶(hù)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(yǔ)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(jī)最高的學(xué)生的學(xué)號(hào)。正確的SeLECT的語(yǔ)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(hào)和成績(jī)。正確的SELECT語(yǔ)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(mén)以上課程的學(xué)生總成績(jī)(不統(tǒng)計(jì)不及格的課程),并要求按總成績(jī)的降序捧列出來(lái)。正確的SElECT語(yǔ)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(yǔ)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)
10.SQL語(yǔ)言是(b )的語(yǔ)言,易學(xué)習(xí)。
A.過(guò)程化
B.非過(guò)程化
C.格式化
D.導(dǎo)航式
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