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計算機三級《數(shù)據(jù)庫技術》考前模擬題和答案

時間:2024-09-09 07:20:04 試題 我要投稿
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計算機三級《數(shù)據(jù)庫技術》考前模擬題和答案

  計算機三級考試備考工作已經(jīng)進入緊張沖刺階段,不知道同學們都復習得怎么樣呢?以下是編搜索整理的一份計算機三級《數(shù)據(jù)庫技術》考前模擬題和答案,供參考練習,預祝考生們考出自己理想的成績!

  1.假定學生關系是S(S#,SNAME,SEX,AGE),課程關系是C(C#,CNAME,TEACHER),學生選課關系是SC(S#,C#,GRADE)。要查找選修 "COMPUTER"課程的"女"學生姓名,將涉及到關系(d )

  A.S

  B.SC, C

  C.S,SC

  D.S,C,SC

  2.SQL語言中,實現(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,修改表結構的是(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"的學生中成績最高的學生的學號。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生總成績(不統(tǒng)計不及格的課程),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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