Discuss the entity integrity and referential integrity constraints.

f. Weak entities do not have their own key attributes. Justify the statement. g. Explain ACID properties of transactions. (7×4) Q.2 a. Define foreign key. What is this concept used for? (6) b. Discuss the entity integrity and referential integrity constraints. Why is each considered important? (6) c. Why are duplicate tuples not allowed in a relation?


 

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