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A set of data within a table, represented by a single column or multiple columns, that corresponds to null values a . composite key b
A set of data within a table, represented by a single column or multiple columns, that corresponds to null values a composite key b none of these c super key d candidate key e foreign key
A set of data within a table, represented by a single column or multiple columns, that
corresponds to null values
a composite key
b none of these
c super key
d candidate key
e foreign key
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