Question: Consider a many - to - one relationship R between entity sets A and B . Suppose the relation created from R is combined with

Consider a many

-

-

one relationship R between entity sets A and B

.

Suppose the relation created from R is combined with the relation created from A

.

In SQL

,

attributes participating in a foreign key constraint can be null. Explain how a constraint on total participation of A in R can be enforced using not null constraints in SQL

.

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