若要将学生表student中的student_no字段设置为主键,可以在创建表中使用______代码片段。 A: primarykeystudent_nochar(10) B: student_noprimarykey C: primarystudent_nochar(10) D: student_nochar(10)primarykey
若要将学生表student中的student_no字段设置为主键,可以在创建表中使用______代码片段。 A: primarykeystudent_nochar(10) B: student_noprimarykey C: primarystudent_nochar(10) D: student_nochar(10)primarykey
若用如下的SQL语句创建一个student表: A: EATETABLEstudent(NOCHAR(4)NOTNULL, B: MECHAR(8)NOTNULL, C: XCHAR(2), D: ESMALLINT); E: 插入到student表中的是()。 F: ('1031','曾华',男,23) G: ('1031','曾华',NULL,NULL) H: (NULL,'曾华','男',23) I: ('1031',NULL,'男',23)
若用如下的SQL语句创建一个student表: A: EATETABLEstudent(NOCHAR(4)NOTNULL, B: MECHAR(8)NOTNULL, C: XCHAR(2), D: ESMALLINT); E: 插入到student表中的是()。 F: ('1031','曾华',男,23) G: ('1031','曾华',NULL,NULL) H: (NULL,'曾华','男',23) I: ('1031',NULL,'男',23)
【单选题】使用命令添加用户student,设置密码为student,然后使用命令删除该用户。 A. useradd student passwd student userdel student B. useradd student passwd student sudo userdel student C. useradd student sudo passwd student sudo userdel student D. su root useradd student passwd student userdel student
【单选题】使用命令添加用户student,设置密码为student,然后使用命令删除该用户。 A. useradd student passwd student userdel student B. useradd student passwd student sudo userdel student C. useradd student sudo passwd student sudo userdel student D. su root useradd student passwd student userdel student
删除数据表student的命令是________。 A: drop table student; B: drop student; C: delete table student; D: drop student;
删除数据表student的命令是________。 A: drop table student; B: drop student; C: delete table student; D: drop student;
VBA中打开“student”表的语句是( )。 A: Docmd.OpenForm”student” B: Docmd.OpenQuery"student" C: Docmd.OpenTable"student" D: Docmd.Openreport"student"
VBA中打开“student”表的语句是( )。 A: Docmd.OpenForm”student” B: Docmd.OpenQuery"student" C: Docmd.OpenTable"student" D: Docmd.Openreport"student"
【单选题】定义一个学生类Student,则初始化一个学生对象的语句是( A. Student s ; B. Student s = new Student(); C. Student s = new student(); D. Student s = s.student();
【单选题】定义一个学生类Student,则初始化一个学生对象的语句是( A. Student s ; B. Student s = new Student(); C. Student s = new student(); D. Student s = s.student();
声明并创建一个学生类Student的对象s,下列语法格式正确的是: A: Student s = Student(); B: Student s; C: Student s = new Student(); D: Student s = new ();
声明并创建一个学生类Student的对象s,下列语法格式正确的是: A: Student s = Student(); B: Student s; C: Student s = new Student(); D: Student s = new ();
Given that Student is a class, how many reference variables and objects are created by the following code? Student studentName, studentId; studentName = new Student(); Student stud_class = new Student();
Given that Student is a class, how many reference variables and objects are created by the following code? Student studentName, studentId; studentName = new Student(); Student stud_class = new Student();
用于删除数据表student正确的语句是: A: drop student B: delete student C: drop database student D: drop table student
用于删除数据表student正确的语句是: A: drop student B: delete student C: drop database student D: drop table student
Li Ting is a ______. A: first-year student B: second-year student C: third-year student
Li Ting is a ______. A: first-year student B: second-year student C: third-year student