网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
设有如下语句:SELECTSUBSTRING('student',4,3);执行结果是()
A、den
B、stu
C、ent
D、uden
参考答案
更多 “ 设有如下语句:SELECTSUBSTRING('student',4,3);执行结果是() A、denB、stuC、entD、uden ” 相关考题
考题
设有学生数据库：student(sno，sname，sex，age，dept)。现要查询所有刘姓学生的信息，可使用如下的 SQL语句：SELECT*FROM student WHERE【 】。
考题
类Student代码如下:DclassStudent{Stringname;intage;Student(Stringnm){(构造方法)name=nm;}}执行语句Studentstu=newStudent()后,字段age的值是哪项?()
A.0B.nullC.falseD.编译错误
考题
类Student代码如下:classStudent{Stringname;intage;Student(Stringnm){name=nm;}}执行语句Studentstu=newStudent()后,字段age的值是哪项?()
A.0B.nullC.falseD.编译错误
考题
You need to design a student registration database that contains several tables storing academic information.The STUDENTS table stores information about a student. The STUDENT_GRADES table storesinformation about the student‘s grades. Both of the tables have a column named STUDENT_ID. The STUDENT_ID column in the STUDENTS table is a primary key.You need to create a foreign key on the STUDENT_ID column of the STUDENT_GRADES table thatpoints to the STUDENT_ID column of the STUDENTS table. Which statement creates the foreign key?（）A. CREATE TABLE student_grades (student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT student_id_fk REFERENCES (student_id) FOREIGN KEY student (student_id));B. CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id));C. CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT FOREIGN KEY (student_id) REFERENCES student (student_id));D. CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id));
考题
设有如下定义: int x=10,y=3,z; 则语句printf("%d\n",z=(x%y,x／y)); 的输出结果是( )。A.1SX
设有如下定义: int x=10,y=3,z; 则语句printf("%d\n",z=(x%y,x/y)); 的输出结果是（ ）。A.1B.0C.4D.3
考题
设有数组定义：int a[]={11,22,33,44,55,66,77,88,99}；则执行下列几个语句后的输出结果是_______。 for（int i=0;i设有数组定义：int a[]={11,22,33,44,55,66,77,88,99}；则执行下列几个语句后的输出结果是_______。 for（int i=0;i
热门标签
最新试卷