Data management applications D427 Question and answers already passed 2024
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Course
WGU D427
Institution
WGU D427
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
...
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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