已知s1="I "am a student.",s2='I \'am a student',则print(s1,s2)的输出结果为( ) A: I 'am a student. I 'am a student B: I "am a student. I 'am a student C: I "am a student. I \'am a student D: 程序报错

If the teacher fails the student, there will be trouble for the student.

You must be an active student ______ a passive student.

由于学号(SN)为00291的学生已毕业，欲在关系“Student”中删除该学生的所有信息，用元组关系演算语言实现应为________。 A: GET W (Student): Student. SN = 00291"DELETE W B: GET W: Student. SN = 00291"in StudentDELETE W C: HOLD W (student): Student. SN = 00291"DELETE W D: HOLD W: Student. SN = 00291"in StudentDELETE W

She is a new student. (改为一般疑问句） A: She is a new student? B: She isn't a new student? C: Is she a new student? D: Isn't she a new student?

【多选题】针对学生选课数据库S_T，以下()操作实现了student表与sc之间的自然连接。 A. select student.* ,  cno,  grade  from student  join   sc  on  student.sno=sc.sno B. select student.* ,  sc.*  from student ,  sc  where student.sno=sc.sno C. select student.sno, sname, ssex, sage, sdept , cno, grade  from student ,  sc  where student.sno=sc.sno D. select student.* , cno, grade  from student ,  sc  where  student.sno=sc.sno

Number the events in the order they happen. A: The male student stands up and leaves the table. B: The male student thanks the female student. C: They introduce themselves to each other. D: Two students are studying in the library. E: They shake hands with each other. F: The female student picks up the wallet and runs after the male student.

SQL语句：select student.* , sc.* from student, sc 实现了关系代数中的操作

与查询Select student.* from student,grade Where student.sno=grade.sno and grade.score>90等价的语句是( )。

Joe is a day student, but I am a _ student. A: A.night B: B. border C: C. boring D: D. boarding