Students’ performance in taking tests is influenced by factors age, sex, and ethnic background. A.such thatB.so thatC.such asD.so as
Students’ performance in taking tests is influenced by factors age, sex, and ethnic background.
A.such that
B.so that
C.such as
D.so as
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Parents and teachers should work together to ()students'lives. A、effectB、makeC、influenceD、shape
(28)使用SQL语句向学生表S(SNO,SN,AGE;SEX)中添加一条新记录,学号(SNO),姓名(SN),性别(SEX),年龄(AGE)字段的值分别为0401、王芳、女、18,正确命令是A)APPEND INTO S(SNO,SN, SEX, AGE) VALUES(’0401’,’王芳’,’女’,18)B)APPEND S VALUES(’0401’,’王芳’,’18’,’女’)C)INSERT INTO S(SNO,SN, SEX, AGE) VALUES(’0401’,’王芳’,’女’,18)D)INSERT S VALUES(’0401’,’王芳’,’18’,女,)
S(S,SN,SEX,AGE,DEPT)C(C,CN)SC(S,C,GRADE)其中:S为学号,SN为姓名,SEX为性别,AGE为年龄,DEP S(S#,SN,SEX,AGE,DEPT) C(C#,CN) SC(S#,C#,GRADE) 其中:S#为学号,SN为姓名,SEX为性别,AGE为年龄,DEPT为系别,C#为课程号, CN为课程名,GRADE为成绩。检索所有比“王华”年龄大的学生姓名、年龄和性别。 正确的SELECT语句是______。A.SELECT SN,AGE,SEX FROM S WHERE AGE>(SELECT AGE FROM S WHERE SN=‘王华’)B.SELECT SN,AGE,SEX FROM S WHERE SN=‘王华’C.SELECT SN,AGE,SEX FROM S WHERE AGE>(SELECT AGE WHERE SN=‘王华’)D.SELECT SN,AGE,SEX FROM S WHERE AGE>王华 AGE
以下程序需要实现的功能是:在C盘根目录下建立一个名为Students.txt的顺序文件。单击命令按钮后,输入4个学生的个人信息,包括name、sex和age,将这些信息写入文件中。请填空。Private Sub Form_Click()Open【 】For Output As 1For i=1 To 4name=InputBox("姓名")age=InputBox("年龄")sex=InputBox("性别")Write【 】Next iClose 1End Sub
在“学生-选课-课程”数据库中的3个关系如下:S(SNO, SNAME, SEX, AGE); C(CNO, CNAME, TEACHER);SC(SNO, CNO, GRADE),查询年龄大于19岁的女学生的学号。若用关系代数表达式来表示为()。A.ПSNO (σSEX=’女'(S) -σAGE<=19(S) )B.ПSNO (σSEX=’女'(S) ∩ σAGE>19(S) )C.ПSNO (σSEX='女'∧ AGE>19(S))D.ПSNO (σSEX=’女’(S) ∪ σAGE>19(S) )
要求男生(SEX=‘M’)年龄(AGE)在15到60之间,女生(SEX=‘F’)年龄在15到55之间,则正确的约束检查语句是()。A.CHECK(AGE>=15 AND ((SEX=’M’ AND AGE <=60) AND (SEX=’F’ AND AGE<=55)))B.CHECK(AGE>=15 AND ((SEX=’M’ AND AGE <=60) OR (SEX=’F’ AND AGE<=55)))C.CHECK(AGE>=15 OR ((SEX=’M’ AND AGE <=60) OR (SEX=’F’ AND AGE<=55)))D.CHECK(AGE>=15 OR ((SEX=’M’ AND AGE <=60) AND (SEX=’F’ AND AGE<=55)))
13、在“学生-选课-课程”数据库中的3个关系如下:S(SNO, SNAME, SEX, AGE); C(CNO, CNAME, TEACHER);SC(SNO, CNO, GRADE),查询年龄大于19岁的女学生的学号。若用关系代数表达式来表示为()。A.ПSNO (σSEX=’女'(S) -σAGE<=19(S) )B.ПSNO (σSEX=’女'(S) ∩ σAGE>19(S) )C.ПSNO (σSEX='女'∧ AGE>19(S))D.ПSNO (σSEX=’女’(S) ∪ σAGE>19(S) )
16、要求男生(SEX=‘M’)年龄(AGE)在15到60之间,女生(SEX=‘F’)年龄在15到55之间,则正确的约束检查语句是()。A.CHECK(age>=15 AND ((SEX=’M’ AND AGE <=60) AND (SEX=’F’ AND AGE<=55)))B.CHECK(age>=15 AND ((SEX=’M’ AND AGE <=60) OR (SEX=’F’ AND AGE<=55)))C.CHECK(age>=15 OR ((SEX=’M’ AND AGE <=60) OR (SEX=’F’ AND AGE<=55)))D.CHECK(age>=15 OR ((SEX=’M’ AND AGE <=60) AND (SEX=’F’ AND AGE<=55)))
【单选题】按照年龄的升序显示学生信息,正确的命令是?A.db.students.find().sort({"age":1})B.db.students.find().sort({"age":-1})C.db.students.find().sort("age")D.db.students.find().sort({"age":"asc"})