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Data management applications D427 Question and answers already passed 2024 $13.49   Add to cart

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Data management applications D427 Question and answers already passed 2024

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Data management applications D427 Question and answers already passed 2024 Data management applications D427 database model components data structure, operations, and rules relational model database model based on tabular data structure; used for banks, airline reservations big data ...

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  • September 1, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • WGU D427
  • WGU D427
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Data management applications D427
database model components
data structure, operations, and rules




relational model
database model based on tabular data structure; used for banks, airline
reservations




big data
characterized by unprecedented data volumes and rapidly changing data
structures




Set
unordered collection of elements enclosed in braces {a,b,c} = {c,b,a}




tuple
ordered collection of elements closed in parenthesis (a,b,c) is different from
(c,b,a)




table
has a name, fixed tuple of columns, and a varying set of rows

,column
has a name and a data type




row
unnamed tuple of values, each value corresponds to a column and belongs to
the columns data type




Since a table is a set of ___: the ___ have no inherent order
row




data type
named set of values, from which column values are drawn




table, column, row, data type
Databases




relation, attribute, tuple, domain
Mathematics

, File, field, record, data type
Files




relational operation: Select
selects a subset of rows of a table




relational operation: Project
eliminates one or more columns of a table




relational operation: product
lists all possible combinations of rows of two tables




relational operation: join
lists all combination of rows of two tables




relational operation: union
selects all rows of two tables




relational operation: intersect

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