Data Management - Applications - D427 questions fully solved & updated 2025.

Data Management -
Applications - D427 questions
fully solved & updated 2025

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