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計(jì)算機(jī)等考三級(jí)數(shù)據(jù)庫(kù)考前模擬試題

計(jì)算機(jī)等考三級(jí)數(shù)據(jù)庫(kù)考前模擬試題

  數(shù)據(jù)是用物理符號(hào)記錄下來(lái)的可以鑒別的.信息。下面給大家整理了計(jì)算機(jī)等考三級(jí)數(shù)據(jù)庫(kù)考前模擬試題,歡迎閱讀!

  計(jì)算機(jī)等考三級(jí)數(shù)據(jù)庫(kù)考前模擬試題

  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(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")


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