Graduate teaching assistants (TAs) use the solution manual to grade 200 assignments quickly. While professors often modify numbers, the methodology remains constant.
While the "Fundamentals Database Systems Elmasri Navathe Solution Manual" is an invaluable study aid, it should be used ethically. Using it to copy homework assignments directly often leads to poor performance on proctored exams where the manual isn't available. Use it to learn, not to bypass the work.