Tarzan’s name is given by the gorilla mother.()
第1题:
对于基本表S(S#,NAME,SEX,BIRTHDAY)和SC(S#,C#,ORADE),其中S#、NAME、 SEX、BIRTHDAY、C#和GRADE分别表示学号、姓名、性别、生日、课程号和年级。有一 SQL语句:
SELECT S#,NAME
FROM S
WHERE S# NOTIN
(SELECT S#
FROM SC
WHERE C#='C102');
其等价的关系表达式是______。
A.πS#.NAME(σC#≠'C102'(SSC) )
B. πS#.NAME(S)-πS#.NAME(σC#='C102'(SSC) )
C.πS#.NAME(SσC#≠'C102'(SC) )
D.πS#.NAME(S(SC) )
第2题:
3、若有如下定义,则选项中不正确的语句是_________。 Structure student Dim Name As String Dim score As Integer End Structure Dim s1,s2 as Studen
A.s2.Name="zhang"
B.s1 = s2
C.s1.score = s2.score
D.Student.Name = s2.Name
第3题:
请改正下面程序中存在的错误。 def StudentInfo(country='China', chineselevel='A', name): print('%s,%s,%s'%(name,country,chineselevel)) StudentInfo(country='America', chineselevel='B', name='John')
第4题:
A.Arrays.sort(s);
B.s=newTreeSet(s);
C.Collections.sort(s);
D.s=newSortedSet(s);
第5题:
若有如下定义,则选项中不正确的语句是_________。 Structure student Dim Name As String Dim score As Integer End Structure Dim s1,s2 as Student
A.s2.Name="zhang"
B.s1 = s2
C.s1.score = s2.score
D.Student.Name = s2.Name