Consider a relation R with five attributes X, Y, Z, W, V. You are given the following dependencies: {X -> Y, YZ-> W, X->Z} List all candidate keys for R. Please justify your answer.   Is R in 3NF? Please justify.   Is R in BCNF? Please justify.

Which of the following statements about relational algebra equivalence rules is correct?

Which one of the following statements about normal forms is FALSE?

A disk with sector size being 1024 bytes, 2000 tracks per surface, 50 sectors per track, 5 double-sided platters and average seek time: 10msec. Which of the followings is NOT a valid page size?

Consider the following relations:  Suppliers(sid: integer, sname: string, address: string) Parts(pid: integer, pname: string, color: string) Catalog(sid: integer, pid: integer, price: real) Write the following queries in SQL and translate each of them into two equivalent relational algebra:  a. Find the names of suppliers who supply all blue parts. b. Find the names and pids of parts that have a price less than 200 dollars So the deliverables should be two SQL statements and 4 relational algebras. For relational algebra, use the following notation:  Selection: 

Which of the following statements is FALSE when it comes to discuss why I/O costs are important in DBMS 

Reading B Read the following Japanese folktale. (1 x 5 = 5) 強(つよ)い＝strong　都(みやこ)＝capital; metropolis　お姫(ひめ)さま＝princess　家来(けらい)＝servant　鬼(おに)＝demon Choose “True” if the information is correct. If the information is not correct, choose “False”. Issunboshi is short but a strong boy. Issunboshi wanted to go to the capital to become a rich samurai. Issunboshi was spending time with the princess and didn’t work hard. The demon wanted to take the beautiful princess to home. Issunboshi and the princess married, and they had a nice life.

Why can high-starch diets be problematic for both ruminants and hindgut fermenters?

What is the primary nutritional advantage of the large fermentation chamber in ruminants?

Beet pulp may appear higher in “sugar” than alfalfa on a feed tag. Why can this be misleading?