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What are the two integrity rules?
Ans: The two integrity rules are: Entity Integrity Rule & Referential Integrity Rule.
Entity Integrity Rule - If the attribute A of relation R is a major attribute of R then A cannot agree to take null values.
Referential Integrity Rule - In referential integrity, it is make sure that a value that appears in one relation for a given set of attributes as well appears for a particular set of attributes in another relation.
Types of data independence Data independence can be classified into the following two types: Physical Data Independence: This means that for any change made in the physi
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Give an example of enforcement in Typing. You can understand the idea of enforcement as it makes sure objects of dissimilar classes may not be interchanged as below: Exampl
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What is first normal form? The domain of attribute must contain only atomic (simple, indivisible) values.
Consider the relations given below Borrower (id_no, name) Book (accno., title, author, borrower_idno) (a) Define the above relations as tables in SQL forming real world assumptio
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