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Define Partial Key and Primary Key
A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar owner entity. Primary key is a unique key but not comprise null values. An entity set can comprise at most one primary key.
Question: a) There are three concurrency problems, i.e. three types of potential mistake which could occur if concurrency control is not properly enforced in the database syst
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explain the level architectures of the database management system
Explain the difference between using functions along with and without grouping attributes in relational algebra. Give examples. Ans: Group functions are used to group data of
Describe the iterative and incremental life cycle For an iterative and incremental life cycle, two criteria are process and time. The main components of showing a project devel
What is a database? Database - Basically in simple terms A database is a collection of inter related data and/or information stored so which it is available to several users
Need an expert in ER database theoretical and modeling database system Project Description: Need an expert in ER database theoretical and modeling database systems? Skills
List some instances of collection types? a) sets b) arrays c) multisets
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.
Design a gennalization and specialization hierarchy for an automobile sales company
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