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Adding Redundant Associations for Efficient Access
Redundant associations do not add any type of information, therefore during design we should actually examine structure of object model for implementation and try to establish whether we could optimize critical parts of completed system. New associations can be added? Or old associations can be removed? The derived association does not require adding any information to the network, they help increasing model information in efficient mode.
What is aggregate function? Briefly describe it? Aggregate functions are functions that take a collection of values as input and return a one value. SQL offers 5 built-in aggre
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1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
external view of DBMS in healthcare department?
List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization
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