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Key terms:
relation
database
tuple
query
attribute
fds
invoice
null
codd
relational model
header
predicate
schema
constraint
dbms
superkey
rightarrow y
candidate key
relational database
darwen
attribute names
invoice no
subseteq h
finite set
edgar f
relation universe
deviations
sql table
functional dependency
attribute value
set of fds
query language
sql queries
third manifesto
rightarrow z
invoice line
cartesian product
logical schema
free variables
every attribute
relation schema
database schema
holds in all relation
column definitions
relational model requires
database management system
appear more than once
all relation universes over
holds in a relation universe
relational database management
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