DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Expert Solution & Answer
Chapter 15, Problem 8PE
Explanation of Solution
Sort-based
Suppose be two relations and has to be computed.
- Sort relation “s” on “S” for sort-based algorithm. Sort relation “r” on (T, S).
- Now, start scanning “r” and look at the “T” attribute values of the first tuple.
- Scan “r” till tuples have same value of “T”. Also scan “s” simultaneously and check whether every tuple of “s” also occurs as the “S” attribute of “r”, in a fashion similar to merge join.
- If this is the case, output that value of “T” and proceed with the next value of “T”.
- Relation “s” may have to be scanned multiple times but “r” will only be scanned once.
- Total disk accesses, after sorting both the relations, will be “|r| 9 N * |s|”, where “N” is the number of distinct values of “T” in “r”.
Hash-based algorithm for computing the relational division operation:
- Let assume that for any value of “T”, all tuples in “r” with that “T” value fit in memory, and consider the general case at the end...
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Students have asked these similar questions
2. Consider the following pseudocode for partition:
function partition (A,L,R)
pivotkey = A [R]
t = L
for i
L to R-1 inclusive:
if A[i] A[i]
t = t + 1
end if
end for
A [t] A[R]
return t
end function
Suppose we call partition (A,0,5) on A=[10,1,9,2,8,5]. Show the state of the list at the
indicated instances.
Initial A
After i=0 ends
After 1 ends
After i 2 ends
After i = 3 ends
After i = 4 ends
After final swap
10 19 285
[12 pts]
.NET Interactive
Solving Sudoku using Grover's Algorithm
We will now solve a simple problem using Grover's algorithm, for which we do not necessarily know the solution beforehand. Our problem is a 2x2 binary sudoku, which in our case has two simple rules:
•No column may contain the same value twice
•No row may contain the same value twice
If we assign each square in our sudoku to a variable like so:
1
V V₁
V3
V2
we want our circuit to output a solution to this sudoku.
Note that, while this approach of using Grover's algorithm to solve this problem is not practical (you can probably find the solution in your head!), the purpose of this example is to demonstrate the
conversion of classical decision problems into oracles for Grover's algorithm.
Turning the Problem into a Circuit
We want to create an oracle that will help us solve this problem, and we will start by creating a circuit that identifies a correct solution, we simply need to create a classical function on a quantum circuit
that…
using r language
Chapter 15 Solutions
DATABASE SYSTEM CONCEPTS LCPO
Knowledge Booster
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