Computers and Technology, 12.12.2019 03:31 evanwall91

An n-way join performs consecutive n-1 joins among n tables. for each of the following 8-way joins, state how many join orders are possible and why (make sure to explain the reason). note ri ⋈ rj and rj ⋈ ri (switching around the order of two joined relations) are different join orders. in the join expressions below, ⋈ denotes an inner join, |⋈ denotes a left outer join, ⋈| denotes a right outer join, and |⋈| denotes a full outer join. hint: note commutativity of the different types of join operations.

a) r1 ⋈ r2 ⋈ r3 ⋈ r4 ⋈ r5 ⋈ r6 ⋈ r7 ⋈ r8

b) r1 ⋈ r2 ⋈ r3 |⋈ r4⋈ r5 ⋈ r6 ⋈ r7 ⋈ r8

c) r1 ⋈ r2 ⋈ r3 ⋈| r4⋈ r5 ⋈ r6 ⋈ r7 ⋈ r8

d) r1 ⋈ r2 ⋈ r3 |⋈| r4⋈ r5 ⋈ r6 ⋈ r7 ⋈ r8

Answers: 3

Show answers

Another question on Computers and Technology

Computers and Technology, 21.06.2019 18:20

Write a method replacekey in the minheap class with the following signature: public void replacekey(integer oldkey, integer newkey) the method will replace the first occurrence of oldkey with the newkey, and restore the min-heap property after the change. if the oldkey does not exist in the heap, the method prints an appropriate message and returns without changing the heap. example: suppose our binary heap object (bh) has the following keys: *** 4 6 7 32 19 64 26 99 42 54 28 then the method call: bh.replacekey (oldkey integer(54), newkey integer(2))

Answers: 1

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, 22.06.2019 20:30

In this lab, you complete a prewritten c program that calculates an employee’s productivity bonus and prints the employee’s name and bonus. bonuses are calculated based on an employee’s productivity score as shown below. a productivity score is calculated by first dividing an employee’s transactions dollar value by the number of transactions and then dividing the result by the number of shifts worked.

Answers: 3

Answer

Computers and Technology, 23.06.2019 03:30

Ihave a singular monitor that is a tv for my computer. recently, i took apart my computer and put it back together. when i put in the hdmi cord and booted the computer to see if it worked, the computer turned on fine but the screen was blue with "hdmi no signal." i've tried everything that doesn't require buying spare parts, any answer is appreciated!

Answers: 1

Answer

You know the right answer?

An n-way join performs consecutive n-1 joins among n tables. for each of the following 8-way joins,...

Questions