Skip to main content

CST 363 Week 3 Learning Journal

 

  1. Someone described normalization rule as  "a non-key column depends on the key, the whole key, and nothing but the key, so help me Codd."  Key refers a primary or other candidate key of a table.  If the key has multiple columns, then "whole key" means  all columns together and not just some part of the key.  Explain in your words what 3rd normal form is and why it is important.
  2. What is an SQL view.  How is it similar to a table? In what ways is it different?

1. From the research I conducted online, 3rd normal form is where a table is organized in such a way that there are no transitive relationships in this system. This means that the key and associated values of a table are directly related. For example, if you have a table with a course id (primary key), course title, instructor and salary in a table, the instructor and salary columns can be moved into a separate table because the instructor and salary are not dependent on the course id and title.

2. SQL views are a way of modifying an existing table to present the data in a way that may make more sense to the user. One of the best uses for a view is to allow users access to certain parts of the table. This could be for security reasons. A table could contain the social security numbers and salaries of employees. The table may also contain information that employees need but the SSN and salaries should be kept hidden. Using a view the same table could be used but the SSN and salaries left hidden. This allows the original table to maintain it's current form and still allow users to access the table via the protected view.

Comments

Post a Comment

Popular posts from this blog

CST 370 Week 4 Journal

 This week primarily consisted of the Mid term which encompassed the first three weeks of learning. So far, this class has been challenging, but I am beginning to grasp some of the main concepts. I find that doing a daily review of the materials I have learned helps me to feel a little more confident that I understand. I feel that the main ideas have been computing the time complexity of the algorithm and getting familiar with some established algorithms for solving common problems. I will continue to study the new material and review previous materials to continue to improve.
Post a Comment
Read more

Week 5 Learning Journal

Part One:  Supporting and Commenting on Teammate's Goals I visited the following teammate's blogs and commented on their goals. Juan's Blog Vance's Blog Part Two: Possible Capstone Ideas The three ideas I have for my capstone project are two different mobile apps and one indie game. For the two apps I am thinking of creating something in Swift, the programming language of iOS. The first app is a passion project that involves a list builder for a miniature tabletop game called OnePageRules. It is an independent miniature game ruleset and already has a web version. My app would take that template and adapt it for iOS. The second app would be a simple star wars app that utilizes an online API for Star Wars call SWAPI. This API has a number of entries related to the Star Wars universe in JSON format. My app would connect to this online API, download specific pieces of data and display them in the app.  The third idea would be to create a simple side scroller game. The game ...
Post a Comment
Read more

Leetcode Practice Reflection 1.Two Sum

LeetCode Practice Reflection - 1. Two Sum Date:   19MAY25 What I Worked on Today: Practiced doing LeetCode Problem 1.Two Sum. What I Learned: - How to use the enumerate() function - How to optimize possible solutions after considering brute force methods - How to declare a new dictionary (key value pair) Code Snippet I Wrote or Studied: class Solution(object): def twoSum(self, nums, target): seen = {} for i, num in enumerate(nums): compliement = target - num if compliment in seen: return [seen[compliment], i] seen[num] = i In My Own Words: This function takes in a list of numbers and will return the index of the two numbers that add up to the provided target value. The way this program works is that it creates a dictionary called "seen". It will then iterate through the list of numbers and use the enumerate function to keep track of the index and the value of the specific item in the provided list. The for loop will calculate the compliment numbe...
Post a Comment
Read more