Answered: What are the different ways in naming…

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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import json, datetime, csvfrom pprint import pprint Question 3 - Using the cleaned list of lists from question 1, create a dictionary of dictionaries where each key in the outer dictionary is an author whose last name starts with the letter 'S'. - Each inner dictionary should contain the number of books that author has written as 'Number of Books' - It should contain the earliest book title for that author based on year with the key 'First Book' - Finally it should contain the latest book title for that author based on year with the key 'Last Book' - If an author has only one book put the same title in both places - Return the dictionary of dictionaries def author_history(cleaned_list): Args: cleaned_list (list) Returns: dictionary of dictionaries Output: {'SafranFoer,Jonathan': {'First Book': 'ExtremelyLoudandIncrediblyClose', 'Last Book': 'ExtremelyLoudandIncrediblyClose',…
Topic: Binary Operation True or False The set R with the operation a * b = a, every number is a right identity. With the operation a * b = b, every number is a left identity.
def remove_after_kth(items, k=1): Given a list of items, some of which may be duplicated, create and return a new list that is otherwise the same as items, but only up to k occurrences of each element are kept, and all occurrences of that element after those first k are discarded. Hint: loop through the items, maintaining a dictionary that remembers how many times you have already seen each element. Update this count as you go, and append each element to the resultlist only if its count is still at most equal to k. items k expected results [42, 42, 42, 42, 42, 42, 42] 3 [42, 42, 42] ['tom', 42, 'bob', 'bob', 99, 'bob', 'tom', 'tom', 99] 2 ['tom', 42, 'bob', 'bob', 99, 'tom', 99] [1, 2, 3, 4, 5, 4, 3, 2, 1, 2, 3, 4, 5, 4, 3, 2, 1] 1 [1, 2, 3, 4, 5] [1, 2, 3, 4, 5, 4, 3, 2, 1, 2, 3, 4, 5, 4, 3, 2, 1, 2, 3, 4, 5] 3 [1, 2, 3, 4, 5, 4, 3, 2, 1, 2, 3, 4, 5, 1, 5] [42, 42, 42, 99, 99, 17] 0 [ ] Please add comments between the codes so I can understand
What do you mean by internal sorts?
Run- on Sentences & fragments.
In this task you will work with the linked list of digits we have created in the lessons up to this point. As before you are provided with some code that you should not modify: A structure definition for the storage of each digit's information. A main() function to test your code. The functions createDigit(), append(), printNumber(), freeNumber(), readNumber() and divisibleByThree() (although you may not need to use all of these). Your task is to write a new function changeThrees() which takes as input a pointer that holds the address of the start of a linked list of digits. Your function should change all of those digits in this linked list that equal 3 to the digit 9, and count how many replacements were made. The function should return this number of replacements. Provided code
Python If you have two sets like this, s1 = {1,2,3,4,5,6,7,8,9}, s2 = {1,5,7,9}. How would you find the common elements in these sets.
What is the difference between Set and Map?
What are semijoins and how do they perform performance?
What is a map file and how do you make one?
None
What will happen if a set has duplicate entries? python the duplicate copies will not be affected the duplicate copies will still be printed none the duplicate copies will be ignored

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What are the different ways in naming sets? Give1 example each.