Exam (elaborations)
D426 WGU Notes (1).
Exam of 9 pages for the course MKT 3413 at MKT 3413 (D426 WGU Notes (1).)
[Show more]
Seller
Follow
Content preview
D426 WGU NotesDatabase 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
✅✅-stores integer values
INT (data type) -
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
The benefits of buying summaries with Stuvia:
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
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
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 lydiaomutho. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$11.47. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79271 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now