NEWEST 2025/2026 WGU D427 DATA MANAGEMENT
APPLICATIONS EXAM PRE ASSESSMENT AND OBJECTIVE
ASSESSMENT ACTUAL EXAM COMPLETE QUESTIONS AND
WELL ELABORATED ANSWERS (100% CORRECT VERIFIED
ANSWERS) A NEW UPDATED VERSION |GUARANTEED PASS
A+
Name 3 relational rules:
Answer- Unique Primary Key
Unique Column Names
No duplicate rows
Business rules are based on ___________ ________ and
specific to a particular database.
Answer- business policy
The mathematical term "Domain" is synonymous with
what Database term?
Answer- Data Type
The database term "column" is synonymous with what
File System term?
Answer- Column
,What is SQL?
Answer- a high-level computer language for storing,
manipulating, and retrieving data.
SQL syntax type: Literal
Answer- Explicit values that are string, numeric, or
binary. Strings must be surrounded by single quotes or
double quotes. Binary values are represented with x'0'
where the 0 is any hex value.
What is the definition of an SQL Keyword?
Answer- Words with special meaning. (i.e. commands)
SQL identifiers are objects from the database like:
tables, columns, etc.
,These operations are collectively called ___________
_________ and are the theoretical foundation of the SQL
language. Since the result of relational operations is
always a table, the result of an SQL query is also a table.
Answer- relational algebra
Relational Algebra operation: Select
selects a subset of rows of a table.
Relational Algebra operation: Project
eliminates one or more columns of a table.
Relational Algebra operation: Product
lists all combinations of rows of two tables.
*In the example, the product operation selects all
combinations of Employee (table) and Department (table)
rows
Relational Algebra operation: Join
, combines two tables by comparing related columns.
Relational Algebra operation: Union
selects all rows of two tables.
Relational Algebra operation: Intersect
selects rows common to two tables.
Relational Algebra operation: Difference
selects rows that appear in one table but not another.
Relational Algebra operation: Rename
changes a table name.
Relational Algebra operation: Aggregate
computes functions over multiple table rows, such as sum
and count.
Relational rules are implemented as SQL
______________ and enforced by the database system.
constraints
A statement intended only for humans and ignored by the
database when parsing an SQL statement., is considered
what?
Comment
APPLICATIONS EXAM PRE ASSESSMENT AND OBJECTIVE
ASSESSMENT ACTUAL EXAM COMPLETE QUESTIONS AND
WELL ELABORATED ANSWERS (100% CORRECT VERIFIED
ANSWERS) A NEW UPDATED VERSION |GUARANTEED PASS
A+
Name 3 relational rules:
Answer- Unique Primary Key
Unique Column Names
No duplicate rows
Business rules are based on ___________ ________ and
specific to a particular database.
Answer- business policy
The mathematical term "Domain" is synonymous with
what Database term?
Answer- Data Type
The database term "column" is synonymous with what
File System term?
Answer- Column
,What is SQL?
Answer- a high-level computer language for storing,
manipulating, and retrieving data.
SQL syntax type: Literal
Answer- Explicit values that are string, numeric, or
binary. Strings must be surrounded by single quotes or
double quotes. Binary values are represented with x'0'
where the 0 is any hex value.
What is the definition of an SQL Keyword?
Answer- Words with special meaning. (i.e. commands)
SQL identifiers are objects from the database like:
tables, columns, etc.
,These operations are collectively called ___________
_________ and are the theoretical foundation of the SQL
language. Since the result of relational operations is
always a table, the result of an SQL query is also a table.
Answer- relational algebra
Relational Algebra operation: Select
selects a subset of rows of a table.
Relational Algebra operation: Project
eliminates one or more columns of a table.
Relational Algebra operation: Product
lists all combinations of rows of two tables.
*In the example, the product operation selects all
combinations of Employee (table) and Department (table)
rows
Relational Algebra operation: Join
, combines two tables by comparing related columns.
Relational Algebra operation: Union
selects all rows of two tables.
Relational Algebra operation: Intersect
selects rows common to two tables.
Relational Algebra operation: Difference
selects rows that appear in one table but not another.
Relational Algebra operation: Rename
changes a table name.
Relational Algebra operation: Aggregate
computes functions over multiple table rows, such as sum
and count.
Relational rules are implemented as SQL
______________ and enforced by the database system.
constraints
A statement intended only for humans and ignored by the
database when parsing an SQL statement., is considered
what?
Comment
