Which statement describes Reverse Route Injection (RRI)?()
第1题:
A. Selection, projection, join
B. Difference, projection, join
C. Selection, intersection, join
D. Intersection, projection, join
E. Difference, projection, product
第2题:
The STUDENT_GRADES table has these columns:The register has requested a report listing the students‘ grade point averages (GPA), sorted from highest grade point average to lowest within each semester, starting from the earliest date. Which statement accomplishes this?()
A. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end DESC, gpa DESC;
B. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end ASC, gpa ASC;
C. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end, gpa DESC;
D. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC, semester_end DESC;
E. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC, semester_end ASC;
第3题:
A. income statement
B. statement of owner's equity
C. statement of cash flows
D. balance sheet
第4题:
For the following statements, which one is the strongest symmetrical encryption algorithm?()
第5题:
A. MD5
B. DES
C. Kerberos
D. unauthenticated
E. simple password
第6题:
A. The two statements produce identical results.
B. The second statement returns a syntax error.
C. There is no need to specify DESC because the results are sorted in descending order by default.
D. The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
第7题:
A.
B.
C.
D.
第8题:
A.Only statement I is correct
B.Only statement II is correct
C.Both statements are correct
D.Neither statement is correct
参考答案:D
第9题:
Which statement is TRUE concerning the flash point of a substance ________.
A.It is lower than the ignition temperature
B.It is the temperature at which a substance will spontaneously ignite
C.It is the temperature at which a substance,when ignited,will continue to burn
D.It is the temperature at which the released vapors will fall within the explosive range
第10题:
You issue this statement:ALTER DATABASE BACKUP CONTROLFILE TO TRACE; What does the statement generate?()