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Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
What is a view in SQL? When can views be updated? A view is a virtual table which consists of columns from one or more tables. Through it is same to a table; it is stored in
explain the level architectures of the database management system
What is meant by object identifiers? Object-oriented systems use an object identifier to recognize objects. Object identifiers are unique: that is every object has a single ide
Explain the ACID properties of a transaction Ans: ACID properties are a significant concept for databases. The ACID stands for Atomicity, Consistency, Isolation, and Durability
data models are being replaced over years. Reasons and why does that happen?
sql is relationally complete-justify
What is the use of rename operation? Rename operation is used to rename both relations and an attributes. It uses the as clause, taking the form: Old-name as new-name.
why data in an RDMS need to be normalised
Normal 0 false false false EN-US X-NONE X-NONE
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