WGU D427 DATA MANAGEMENT APPLICATIONS OA AND PRE ASSESSMENT TEST 2026/2027 COMPLETE ACTUAL TEST

WGU D427 DATA MANAGEMENT APPLICATIONS OA AND PRE ASSESSMENT TEST 2026/2027 COMPLETE ACTUAL TEST

Database Model - ANSWER-is a conceptual framework for database systems, with
three parts
3 Parts of the Database Model - ANSWER-Data structures, operations, rules
Data structures - ANSWER-prescribe how data is organized
Operations - ANSWER-manipulate data structures
Rules - ANSWER-govern valid data
Big Data - ANSWER-characterized by unprecedented data volumes and rapidly
changing data structures.
Set - ANSWER-is an unordered collection of elements enclosed in braces.
Ex: {a, b, c} and {c, b, a} are the same, since sets are not ordered.
Tuple - ANSWER-is an ordered collection of elements enclosed in parentheses.
Ex: (a, b, c) and (c, b, a) are different, since tuples are ordered.
Database Terminology - ANSWER-Table
Column
Row
Data Type
Math Terminology - ANSWER-Relation
Attribute
Tuple
Domain
File Terminology - ANSWER-File
Field
Record
Data Type
Select (Relational) - ANSWER-selects a subset of rows of a table
Project (Relational) - ANSWER-eliminates one or more columns of a table
Product (Relational) - ANSWER-lists all combinations of rows of 2 tables
Join (Relational) - ANSWER-combines 2 tables by comparing related columns
Union (Relational) - ANSWER-selects all rows of 2 tables
Intersect (Relational) - ANSWER-selects rows common to 2 tables
Difference (Relational) - ANSWER-selects rows that appear in one table but not another
Rename (Relational) - ANSWER-changes table name
Aggregate (Relational) - ANSWER-computes functions over multiple table rows, such
as sum and count
relational algebra - ANSWER-Theoretical way of manipulating table contents using
relational operators
ex. select, project, product, join...
Relational Rules - ANSWER-logical constraints that ensure data is valid
Examples of Rules - ANSWER-Unique Primary Key - all tables have a primary key
column, or group of columns, in which the values may not repeat
Unique Column Names - different columns of the same table have different names
No Duplicate Rows - no 2 rows of the same table have identical values in all columns
Business Rule - ANSWER-based on business policy and specific to a particular
database
Example of a Business Rule - ANSWER-all rows of the Employee table must have a
valid entry in the DepartCode column
-orPassportNumber values may not repeat in different Employee rows
SQL Constraints - ANSWER-relational rules that are implemented and enforced by the
database system.
Business rules are discovered during database design and often implemented as SQL
Constraints

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