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Which is another name for weak entity? Child is another name of weak entity.
explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks
Normalization :It is a process of examine the given relation schemas based on their primary key and Functional Dependencies (FDs) to achieve the properties Minimizing redun
sy bcs project of hospital managment system
Q. Explain data aggregatio n and discuss different design constraints. Sol. Aggregation One limitation of the E-R model is that it cannot express relationships amon
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:
recovey techniques based on deferred update and immediate update
Example: //REVOKE ALL ON EMP FROM MCA12; (All permissions will be cancelled) You can also cancel only some of the permissions. Drop: A user-
What is a Built-in A notation of identity is built-into the data model or programming language and no user-supplied identifier is needed. This form of identity is used in objec
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
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