Assume that the function call operator() is overloaded for data type String in the usual sense of selecting a substring from a larger string. For a String object string1 with the character string "ABCDEFGHI", what string does string1(4, 2) return?
a. "EF"
b. "EFGHI"
c. "CDEF"
d. "CD"
a. "EF"
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A callback device
a. requires a user to dial-up and login b. calls the user back at a predetermined location c. is difficult to use when travelling to multiple locations d. all of the above
_____ is a powerful operating system originally developed by AT&T for minicomputers-the predecessors of servers that are larger than PCs and smaller than mainframes.
Fill in the blank(s) with the appropriate word(s).
When you reply to an email, the original message is appended to the ________ of the reply
A) bottom B) top C) right D) left
Let there be an unclustered hash index on ProfId and assume that, as before, 5 Professor tuples ?t in one page, 10 Teaching tuples ?t in one page, and the cardinality of Teaching is 10,000. Estimate the cost of computing the above join using index-nested loops and block-nested loops with a 51-page bu?er.
Consider the join Professor Id=ProfId Teaching used in the running example of Section 11.3. Let us change the statistics slightly and assume that the number of distinct values for Teaching.ProfId is 10,000 (which translates into lower weight for this attribute).