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Increases efficiency: Data is stored close to most often used site, therefore retrieval would be faster. Also, data that is not required by local applications is not stored, therefore the size of data to be looked into is smaller.
What is assertion? Mention the forms available. An assertion is a predicate expressing a condition that we wish the database always to satisfy. Domain integrity constraints.
how to write tables and drow E-R diagrams for hosiptal management system and how to normalize and cardinalities?
Give the two reasons for allowing concurrency
What is foreign key? A relation schema r1 derived from an ER schema may contain among its attributes the primary key of another relation schema r2.this attribute is known as a
Why older data models are being replaced by new data modelling 100 words accepted#
Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
What is association? Give an example of association Association is used for establishing relationships among classes. Association describe links among/between classes. For exa
define lock conversion
what benefit can a company gain by managing its own infrasture and services
What's the difference between a primary key and a unique key? Both primary key and unique key enforces uniqueness of the column on which they are explained. But by default prim
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