SCB comm c++ IV

Q: you have identical rows in a table. How do you clean it up?
%A: select into a new table, then overwrite the old, but this involves a lot of disk space and IO
%A: perhaps delete where (select count(*)...) > 1 and rowid > 1 -- using oracle rowid

Q: given a long string of letters A-Z, print a histogram like A:865 times, B:9932 times....

Q: copy a vector to another vector. What if the source is very large? Correct -- you get reallocation, so how do you avoid that?
%A: either reserve or initialize the target vector with sufficient capacity

Q: when would you use private inheritance?