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