Computers and Technology, 13.07.2019 01:20 jjsavage06

Consider a database containing two relations: r(a, b, c) and s(d, e, f). for each of the 12 rewriting rules for relational algebra expression, give an example pair of relational algebra expressions involving r and s for the rule, and give an example pair to show the rewriting rule cannot be used if someof the conditions for the rule is not satisfied. you may want to provide these examples as two tables

Answers: 1

Show answers

Another question on Computers and Technology

Computers and Technology, 22.06.2019 11:30

What does a cascading style sheet resolve a conflict over rules for an element? a. the rule affecting the most content wins b. the rule affecting the most content loses c. the rule with the most specific selector loses d. the rule with the most specific selector wins

Answers: 2

Answer

Computers and Technology, 22.06.2019 15:10

David is in week 3 of his current ashford course and has a paper due by monday night at midnight. he has finished everything but the concluding paragraph. as he boots up his computer to work on it, he sees a flash across the screen and then the screen goes black. he begins to panic as he tries desperately to turn the laptop back on. david should have saved his work on what kind of portable device?

Answers: 2

Answer

Computers and Technology, 23.06.2019 00:00

Suppose you have 9 coins and one of them is heavier than others. other 8 coins weight equally. you are also given a balance. develop and algorithm to determine the heavy coin using only two measurements with the of the balance. clearly write your algorithm in the form of a pseudocode using the similar notation that we have used in the class to represent sorting algorithms

Answers: 1

Answer

Computers and Technology, 23.06.2019 01:10

Problem 1 - hashing we would like to use initials to locate an individual. for instance, mel should locate the person mark e. lehr. note: this is all upper case. generate a hash function for the above using the numbers on your telephone. you know, each letter has a number associated with it, so examine your telephone keypad. generate 512 random 3 letter initials and take statistics on a linked list array size 512 to hold this information report how many have no elements, 1 element, 2 elements, does this agree with the hashing statistics distribution?

Answers: 1

Answer

You know the right answer?

Consider a database containing two relations: r(a, b, c) and s(d, e, f). for each of the 12 rewriti...

Questions