【简答题】Consider a code that satisfies the suffix condition: No codeword is a suffix of any other codeword. (i) Is this a uniquely decodable code? Why? (ii) Can you relate the minimum average length of Suffix...
【单选题】In the relation of tblHire (Loan_Num, ember_Id,Video_Code,Hire_Period, Issue_Date,Due_Date,Return_Date, Reminded,Fine,Paid), Which SQL statements can find the average fine(s) by video where the averag...
A.
select Video_Code,AVG(Fine) as Average_Fine from tblHire group by Video_Code where AVG(Fine)>24;
B.
select Video_Code , AVG ( Fine ) as Average_Fine from tblHire group by Video_Code order by Video_Code having AVG ( Fine )> 24 ;
C.
select Video_Code , AVG ( Fine ) as Average_Fine from tblHire where Fine > 24 ;
D.
select Video_Code , AVG ( Fine ) as Average_Fine from tblHire group by Video_Code having AVG ( Fine )> 24 ;