Using the candidate generation mechanism described above, which itemset(s) will be generated from the following frequent itemset list.L4={abcd, abce, acde, bcde, cdef, cdeg, cdfg, cefg, defg, defh}abcdeO abcdefghO abcdefg, abcdefhabcd, abce, acde, bcde, cdef, cdeg, cdfg, cefg, defg, defhabcde, cdefgabcde, bcdefabcde, acdef, acdeg, bcdef, bcdeg, cdefg, cdefh, cdefg, defghO cdefgO abcde, bcdef, cdefgO defgh Assume the items in L are listed in an order (e.g.,alphabetical)●• Step 1: self-joining L (IN SQL)kinsert into Ck+1select p.item₁, p.item₂, ..., p.itemk, q.item kfrom Lk {p}, Lk {q}where p.item₁=q.item₁, p.itemk-1-q.item k-1, p.item

To generate the candidate itemsets, we use the "join" operation to combine the frequent itemsets…

Using the candidate generation mechanism described above, which itemset(s) will be generated from the following frequent itemset list. L4={abcd, abce, acde, bcde, cdef, cdeg, cdfg, cefg, defg, defh} abcde O abcdefgh O abcdefg, abcdefh abcd, abce, acde, bcde, cdef, cdeg, cdfg, cefg, defg, defh O abcde, cdefg O abcde, bcdef abcde, acdef, acdeg, bcdef, bcdeg, cdefg, cdefh, cdefg, defgh O cdefg O abcde, bcdef, cdefg defgh

Using the candidate generation mechanism described above, which itemset(s) will be generated from the following frequent itemset list. L4={abcd, abce, acde, bcde, cdef, cdeg, cdfg, cefg, defg, defh} abcde O abcdefgh O abcdefg, abcdefh abcd, abce, acde, bcde, cdef, cdeg, cdfg, cefg, defg, defh O abcde, cdefg O abcde, bcdef abcde, acdef, acdeg, bcdef, bcdeg, cdefg, cdefh, cdefg, defgh O cdefg O abcde, bcdef, cdefg defgh

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Using the candidate generation mechanism described above, which itemset(s) will be generated from the following frequent itemset list.
L4={abcd, abce, acde, bcde, cdef, cdeg, cdfg, cefg, defg, defh}
abcde
O abcdefgh
O abcdefg, abcdefh
abcd, abce, acde, bcde, cdef, cdeg, cdfg, cefg, defg, defh
abcde, cdefg
abcde, bcdef
abcde, acdef, acdeg, bcdef, bcdeg, cdefg, cdefh, cdefg, defgh
O cdefg
O abcde, bcdef, cdefg
O defgh

Assume the items in L are listed in an order (e.g.,
alphabetical)
●
• Step 1: self-joining L (IN SQL)
k
insert into Ck+1
select p.item₁, p.item₂, ..., p.itemk, q.item k
from Lk {p}, Lk {q}
where p.item₁=q.item₁, p.itemk-1-q.item k-1, p.item <q.itemk
• Step 2: pruning
forall itemsets c in Ck+1 do
forall k-subsets s of c do
if (s is not in L) then delete c from Ck+1

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