Consider the relation refrig(model#, year, price, manuf_plant, color),which is abbreviated as refrig(m, y, p, mp, c), and the following set f of functional dependencies: f = {m ? mp,{m, y} ? p, mp ? c}
a. evaluate each of the following as a candidate key for refrig, giving reasons why it can or cannot be a key: {m}, {m, y}, {m, c}.
b. based on the above key determination, state whether the relation refrig is in 3nf and in bcnf, giving proper reasons.
c. consider the decomposition of refrig into d = {r1(m, y, p), r2(m, mp, c)}
1. is this decomposition lossless? show why.
2. is this decomposition has the dependency preservation property?

Acomputer is a multipurpose device that accepts input, processes data, stores data, and produces output, all according to a series of stored . the processing unit of most modern computers is a(n) . the instructions that tell a computer how to carry out a task are referred to as computer , which are distributed as software. computers run three main types of software: software, system software, and development tools. an example of system software is a computer system, which is essentially the master controller for all the activities that a digital device performs. digital devices are constructed using tiny electronic components that represent data bits as electrical signals. the system unit houses the system board, which contains several circuits made from semiconducting materials. computers come in three popular form factors: component, , and slate. many of today's digital devices operate on battery power supplied by ion batteries. battery life and lifespan can be extended by following good battery management practices.

Technician a says that with self-adjusting clutch systems, the release bearing constantly rotates. technician b says that the ball bearing portion of the release bearing should be lubricated with high-temperature grease during routine maintenance. which technician is correct?

Which boolean operator enables you to exclude a search term? a} not b} and c} or d} plus