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Mention the type of constraints we can specify in the CREATE command of DDL.
The type of constraints that can be specified are as follows:-
PRIMARY KEY, NOT NULL, UNIQUE, FOREIGN KEY, CHECK.
Define the Query optimisation The query parser commonly generates a standard initial tree to correspond to an SQL query, with no doing any optimization. Such type of a canonica
What is nested relational model? The nested relational model is an extension of relational model in which domains might be either atomic or relation valued.
Strong entity set and weak entity set? Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key.
Consider the subsequent relations along with keys underlined Street (name, location, city) House (number, street_name) Lives (name, house_number) Define the above relations
Q. Describe how an ER schema can be represented by relation schemas and constraints arising from ER design can be mapped to constraints on a relation schema. The entity rela
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
explain in details about one to one binary relationship
Write short notes on Schema diagram. A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema diagram. Every relation appears
I have a small project that contains 3 deliverable s. I have done the first one and I would like you to help me with second one
Benefits of Hashed file Organisation 1. Insertion or search on hash-key is quick. 2. Best if equality search is required on hash-key. Drawbacks of Hashed file
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