What tool do you use to secure remote access by users who utilize the Internet?

None of the query execution plans in Figure 11.3 for queries (11.2)–(11.5) does duplicate elimination. To account for this, let us add one more relational operator, ?, which denotes the operation of duplicate elimination. Modify the plans in Figure 11.3 by adding ? in appropriate places so as to minimize the cost of the computation. Estimate the cost of each new plan.

What will be an ideal response?

What is the primary function of FTP?

What will be an ideal response?