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CREATE TABLE prodtrans ( pno number (4) ptype char (1) CHECK (ptype in ('I','R','S')), qty number (5) FOREIGN KEY pno REFERENCES product (pno) ON DELETE CASCADE);
East Coast Aquarium Relational Database
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
Define the concept of generalization A generalization is relationship between specific kind of thing and general thing. It is also known as "is-a-kind-of" relationship. Inher
Explain the Query Processing Data Query Processing permits a user to report or analyze structured and unstructured data pulled from multiple data sources.
What is a PROJECT operation? The project operation is a unary operation that returns its argument relation with particular attributes left out. Projection is shown by pie (π).
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
recovey techniques based on deferred update and immediate update
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