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Check Constraint
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Key terms:
null
sql
source lang
rows
relational
markers
predicate
evaluate
constraint
coalesce
outer join
codd
boolean
empty string
dml
truth value
relational model
check constraint
inconsistency
left outer join
rdbms
null then
sql standard
null result
placeholder
keywords
ternary logic
world assumption
postgresql
database management
data manipulation language
sql server
concatenation
widespread acceptance
mysql
missing values
pn
inapplicable
third manifesto
microsoft sql server
truth table
closed world assumption
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