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Key terms:
relation
database
attribute
relational model
sql
tuple
invoice
query
rightarrow
predicate
constraint
relational database
codd
null
rightarrow y
header
candidate key
fds
attribute names
schema
subseteq
functional dependency
subseteq h
finite set
darwen
dbms
edgar f
attribute value
deviations
database management
database model
retrieval
cartesian product
foreign key
query language
third manifesto
database management system
logical schema
rightarrow z
free variables
sql queries
predicate logic
database schema
relational database management
database query
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