A maximal subset of connected vertices is called a ____ of G.
A. cycle
B. union
C. subset
D. component
Answer: D
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Implement the University Accommodation Office database using the physical design created in 18.9.
What will be an ideal response?
In applications that cannot tolerate duplicates it may be necessary to use DISTINCT. However, the query plan needed to support DISTINCT requires a sort, which is expensive. Therefore you should only use DISTINCT when duplicates are possible in the result set. Using the schema of Section 4.8, check the following queries to see if duplicates are possible. Explain your answer in each case.
a. ``` SELECT S.Name FROM Student S WHERE S.Id LIKE ’1’ ``` b. ``` SELECT S.Id FROM Student S, Facu lty F WHERE S.Address = F.Address ``` c. ``` SELECT C.CrsCode, COUNT(*) FROM Transcript T GROUP BY T.CrsCode ``` d. ``` SELECT F.Name, F.DeptId, C.ClassTime, C.CrsCode, C.Semester, C.Year FROM Facu lty, Class C WHERE F.Id = C.InstructorId ``` e. ``` SELECT S.Name, F.Name, T.Semester, T.Year FROM Facu lty, Class C, Transcript T, Student S WHERE F.Id = C.InstructorId AND S.Id = T.StudId AND C.CrsCode = T.CrsCode AND C.SectionNo = T.SectNo AND C.Year = T.Year AND C.Semester = T.Semester ```
Before you begin entering data in a worksheet, you should create a _____ for the worksheet.
A. template B. plan C. layout D. file
Which of the following doesn't attach itself to a host but can replicate itself?
a. Worm b. Virus c. Trojan program d. Buffer overflow