名词解释题性毛(pili,sex pili)
名词解释题
性毛(pili,sex pili)
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设有关系模式SC(Sno, Sname, Sex, Birthday, Cno, Cname, Grade, Tno, Tname)满足函数 依赖集:{Sno→Sname, Sno→Sex, Sno→Birthday, Cno→Cname,(Sno, Cno)→Grade, Tno→Tname}.SC的主码和属性集(Sno, Tno)的闭包分别是A.(Sno,Tno)和{Cno,Cname,Grade,Tno,Tname}B.(Sno, Cno,Tno) 和{Sno, Sname, Sex, Birthday, Cno}C.(Sno, Cno)和{Sno, Sname, Sex, Birthday, Cno, Cname, Grade}D.(Sno, Cno,Tno)和{Sno, Sname, Sex, Birthday, Tno, Tname}
下列说法正确的是()A.alter table user drop column sex;B.alter table user add sex varchar(20);C.alter table user drop sex;D.alter table user modify id int primary key;
设有如下定义 struct ss { char name[10]; int age; char sex; } std[3],* p=std; 下面各输入语句中错误的是A.scanf("%d",(*p).age);B.scanf("%s",std.name);C.scanf("%c",std[0].sex);D.scanf("%c",(p->sex));
关系SC(S,SNAME,SEX,SCORE,CNAME),从关系SC中检索男生(SEX =M)并且成绩大于等于60的学生姓名,下述表示( )是正确的。Ⅰ.ЛSNAME(σSCORE>60□SEX='M'(SC))Ⅱ.σSCORE>=60□SEX='M'(ЛSNAME(SC))Ⅲ.ЛSNAME(σSCORE>=60□SEX='M'(ЛSNAME,SCORE,SEX(SC))A.Ⅰ和ⅡB.ⅡC.Ⅰ和ⅢD.Ⅰ
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
若有如下程序: main() { char a[3][5] = {"name","age","sex"},n; for(n=0;n<3;n++) printf("%s\n",a[n]);} 则程序执行后的输出结果是( )。A.nameagesexB.nameC.nameD.name agexex ge age sex x sex
若有以下定义: struct tt{char name[10];char sex;}aa={"aaaa",′F′},*p= 则错误的语句是( )。选项格式:A.scanf("%c",a选项格式:A.sex);B.a选项格式:A.sex=getchar( );C.printf("%c\n",(*p).sex);D.printf("%c\n",p->sex);答案:A解析:sex是一个char类型变量,不是地址,A项应为scanf("%c",B.a选项格式:A.sex=getchar( );C.printf("%c\n",(*p).sex);D.printf("%c\n",p->sex);
设有如下定义 struct ss { char name[10]; int age; char sex; }std[3], * p=std; 下面各输入语句中错误的是A.cin>>(* p).age);B.cin>>std.name);C.cin>>std[0].sex);D.cin>>(p->.sex));
有一张UserInfo表,需要过滤出姓名(username)为xiaoming,性别(sex)为male的数据,假设只有一条数据符合条件,以下哪些语法是正确的?()A、UserInfo.objects.get(username=xiaoming,sex=male)B、UserInfo.objects.get(username=xiaoming).get(sex=male)C、UserInfo.objects.filter(username=xiaoming,sex=male)D、UserInfo.objects.filter(username=xiaoming).filter(sex=male)
BookStore数据库中有客户表Customer(CustomerCode,Name,Sex,Hometown,Email,Telephone,LoginDate,Password)查询Customer表中所有客户的信息,SQL语句:SELECT()FROMCustomerA、*B、CustomerCode,Name,Hometown,Sex,Email,Telephone,LoginTime,PassWordC、CustomerCode,Hometown,Telephone,Name,Sex,Email,LoginTime,PassWordD、CustomerCode~PassWord
数据库中有一张表名称为Student,有列Number,Name,Age,IDCard,Sex。主键为Number。要求查询所有男同学信息,下列哪个SQL语句是正确的?()A、Select* From Student Where Sex=’男’B、Select* From Student Where Number NotIn(Select Number From Student Where Sex=’男’)C、Select* From Student Where NumberIn(Select Numbe rFrom Student Where Sex=’男’)D、Select* From Student Where Sex’男’
使用()语句,将Account表内的性别字段内容,全部都改为“男”。A、Update account SET Sex=´女´where Sex=´男´B、Update account SET Sex=´男´where Sex=´女´C、Update FROM account SET Sex=´女´where Sex=´男´D、Update FROM account SET Sex=´男´where Sex=´女´
在表单中包含性别选项,且默认状态为“男”被选中,下列正确的是()。A、input type=radio name=sex checked男B、input type=radio name=sex enabled男C、input type=checkbox name=sex checked男D、input type=checkbo xname=sex enabled男
单选题CREATE TABLE test(t_idINT,t_nmae CHAR(10))后,增加t_sex字段,以下语句正确的是()。AALTER TABLE test ADD t_sex CHAR(2)BALTER TABLE test ADD t_sexCALTER TABLE test ALTER t_sex CHAR(2)DALTER TABLE test DROP(t_sex CHAR(2))
单选题若有以下定义:struct tt{char name[10];char sex;} aa={aaaa,'F'},*p=aa;则错误的语句是( )。Ascanf(%c,aa.sex);Baa.sex=getchar();Cprintf(%c,(*p).sex);Dprintf(%c,p-sex);
单选题The passage mainly discusses ______.Ahow sex differences are demonstrated in social relationsBhow hormone determines sex differencesCwhy there are differences between males and femalesDwhy men and women have different social roles
单选题如果请求页面中存在两个单选按钮(假设单选按钮的名称为sex), 分别代表男和女,该页面提交后,为了获得用户的选择项,可以使用以下()方法。Arequest.getParameter(sex);Brequest.getParameter(“sex”);Crequest.getParameterValues(sex);Drequest.getParameterValues(“sex”);
名词解释题线毛(Pili,散毛,纤毛,菌毛)