Which statement explicitly names a constraint? ()A. ALTER TABLE student_grades ADD FOREIGN KEY (student_id) REFERENCES students (student_id);B. ALTER TABLE student_grades ADD CONSTRAINT NAME = student_id_fk FOREIGN KEY (student_id) REFERENCES students (st

题目
Which statement explicitly names a constraint? ()

A. ALTER TABLE student_grades ADD FOREIGN KEY (student_id) REFERENCES students (student_id);

B. ALTER TABLE student_grades ADD CONSTRAINT NAME = student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id);

C. ALTER TABLE student_grades ADD CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id);

D. ALTER TABLE student grades ADD NAMED CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id);

E. ALTER TABLE student grades ADD NAME student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id);

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更多“Which statement explicitly names a constraint? () ”相关问题

  • 第1题：

    下面哪一个是错误的?

    A.使用len(列表名)测量元素的个数names_list=["zhangsan","lisi","wangwu"]print(len(names_list))

    B.使用列表名[下标]获取列表的某个元素，例如：names_list=["zhangsan","lisi","wangwu"]print(names_list[2])

    C.向列表中添加新元素有三个方法：append、extend、insert，例如：names_list=["zhangsan","lisi","wangwu"]names_list.append("zhaoliu")names_list.extend(["zhaoliu","liqi"])names_list.insert(1,"zhaoliu")print(names_list)

    D.已有列表nums=[11,22,33,44,55],使用while循环遍历列表nums=[11,22,33,44,55]i=0 whilei

    print(nums[i])i+=1


    正确答案：D

  • 第2题：

    多选题：下面哪个是错误的用python实现存储n个人的姓名？

    A．names1=n*[0] for i in range(n): names1[i]=input('输入{}个人的姓名:'.format(i+1))

    B．names2=[] for i in range(n): names.append(input('输入{}个人的姓名:'.format(i+1)))

    C．names3=[] for i in range(n): name=input('输入{}个人的姓名:'.format(i+1)) names3+=name

    D．names4=[] for i in range(n): names4[i]=input('输入{}个人的姓名:'.format(i+1))

    E．names5=[] for i in range(n): name=input('输入{}个人的姓名:'.format(i+1)) names5+=[name]


    Python 中的变量赋值需要数据类型声明

  • 第3题：

    3.下列选项中，关于Statement描述错误的是（） A: Statement是用来执行SQL语句的 B: Statement是PreparedStatement的子接口 C: 获取Statement实现需要使用Connection的createStatement（)方法 D: PreparedStatement能使用参数占位符，而Statement不行

    A．A B C D

    B．A B C D

    C．A B C D

    D．A B C D


    Statement 是 PreparedStatement 的子接口

  • 第4题：

    下列选项中，关于Statement描述错误的是（）

    A．Statement是用来执行SQL语句的

    B．Statement是PreparedStatement的子接口

    C．获取Statement实现需要使用Connection的createStatement()方法

    D．PreparedStatement能使用参数占位符，而Statement不行


    Statement是PreparedStatement的子接口

  • 第5题：

    下列选项中,关于Statement描述错误的是（)

    A．Statement是用来执行SQL语句的

    B．Statement是PreparedStatement的子接口

    C．获取Statement实现需要使用Connection的createStatement()方法

    D．PreparedStatement能使用参数占位符,而Statement不行


    Statement是PreparedStatement的子接口

  • 第6题：

    已知names是一个如下定义的变量： manes byte ‘Tom bush’ 符合汇编语言语法的正确语句是______。

    A．mov edi,names

    B．mov edi,names[ebx]

    C．mov edi,offset names[ebx]

    D．lea edi,names[ebx]


    lea edi,names[ebx]

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