A relational database has been created to store data about subjects that students are studying. The following is a selection of some data stored in one of the tables. The data represents t he student's name, the personal tutor group,
the personal tutor, the subject studied, the level of study and the subject teacher but there is some data missing:
Xiangfei 3 MUB Computing A DER
Xiangfei 3 MUB Maths A BNN
Xiangfei 3 MUB Physics AS DAB
Mahesh 2 BAR History AS IJM
Mahesh 2 BAR Geography AS CAB
Define the terms used to describe the components in a relational database table using examples from
this table.
ii If this represented all of the data, it would have been impossible to create this table.
What is it that has not been shown here and must have been defined to allow the creation as a relational
[2]

database table? Explain your answer and suggest examples of the missing data.

This graph compares the cost of room and board at educational institutions in texas.

Select the correct answer. what does it indicate when a website displays https instead of http? a. the website is secure. b. there is no secure sockets layer. c. the secure sockets layer is hidden. d. the website is not secure.

When making changes to optimize part of a processor, it is often the case that speeding up one type of instruction comes at the cost of slowing down something else. for example, if we put in a complicated fast floating-point unit, that takes space, and something might have to be moved farther away from the middle to accommodate it, adding an extra cycle in delay to reach that unit. the basic amdahl's law equation does not take into account this trade-off. a. if the new fast floating-point unit speeds up floating-point operations by, on average, 2ă—, and floating-point operations take 20% of the original program's execution time, what is the overall speedup (ignoring the penalty to any other instructions)? b. now assume that speeding up the floating-point unit slowed down data cache accesses, resulting in a 1.5ă— slowdown (or 2/3 speedup). data cache accesses consume 10% of the execution time. what is the overall speedup now? c. after implementing the new floating-point operations, what percentage of execution time is spent on floating-point operations? what percentage is spent on data cache accesses?