100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
WGU D426 Notes | Questions & Answers (100 %Score) Latest Updated 2024/2025 Comprehensive Questions A+ Graded Answers | With Expert Solutions $13.48
Add to cart
Quickly navigate to
Preview
  2.  
  3. WGU
  4.  
  5. WGU

Exam (elaborations)

WGU D426 Notes | Questions & Answers (100 %Score) Latest Updated 2024/2025 Comprehensive Questions A+ Graded Answers | With Expert Solutions
 0 purchase
  • Institution
  • WGU

WGU D426 Notes | Questions & Answers (100 %Score) Latest Updated 2024/2025 Comprehensive Questions A+ Graded Answers | With Expert Solutions

Preview 2 out of 8  pages

Document information

  • August 7, 2024
  • 8
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • wgu d426 notes questions answers 100 score

Written for

All documents for this subject (6644)

Seller

avatar-seller
VasilyKichigin

Reviews received

Content preview

WGU D426 Notes | Questions & Answers (100 %Score) Latest Updated 2024/2025
Comprehensive Questions A+ Graded Answers | With Expert Solutions




Database application - software that helps business users interact with database
systems

Database administrator - responsible for securing the database system against
unauthorized users, enforces procedures

Authorization - limits user access

Rules - database systems ensure data is consistent with structural and business rules

Query processor - interprets queries, creates plan to modify database/retrieve data, and
returns query results

Query optimization - performed by query processor to ensure most efficient instructions
are executed

Indexes - quickly locate data

transaction manager - ensures transactions are properly executed, prevents conflicts
between concurrent transactions, restores database to consistent state

INSERT - insert rows into a table

SELECT - retrieves data from a table

UPDATE - modifies existing rows in a table
- Uses SET clause for new column values
- Uses WHERE clause for which rows to update, or updates all rows

DELETE - deletes rows from a table
- FROM follows table name
- Use WHERE for which rows to delete, or delete all rows

CREATE TABLE - creates new table by specifying the table and column names, and
column data types

INT (data type) - stores integer values

DECIMAL (data type)(M,D) - stores fractional numeric values; numerical with M digits, D
digits is decimal point

, VARCHAR (data type) - stores textual values, values with 0 to N characters

DATE (data type) - stores year/month/day data

Analysis Phase - specifies database requirements without regard to specific database
system

What are requirements represented by? - Entities, relationships, and attributes

Entity - person, place, activity, or thing

Relationship - link between entities

Attribute - descriptive property of an entity

Other names for analysis? - Conceptual deisng, entity-relationship modeling,
requirements definition

Logical Design - - Phase that implements database requirements in a specific database
system

Logical Design in Relational Database Systems - Converts entities, relationships, and
attributes into tables, keys, and columns

Physical Design Phase - Adds indexes and specifies how tables are organized on
storage media, affects processing speed

Data Independence - Principle that Physical Design never affects query results

MySQL Command-Line Client - text interface in MySQL Server, returns an error code
and description if syntactically incorrect/database can't execute

Tuple - ordered collection of elements closed in parentheses

Table - has a name, fixed tuple of columns, and varying set of rows

Column - name and data type

Row - unnamed tuple of values, each value corresponds to a column and belongs to the
column's data type

Data type - named set of values from which column values are drawn

Business rules - based on business policy and specific to a particular database

Explicit values - string, numeric, or binary

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller VasilyKichigin. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $13.48. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

69252 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling
$13.48
  • (0)
Add to cart
Added