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what is er digram given that example of hospital,bank and library er digram.
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
What are three components of the schema architecture proposed by ANSI/SPARC? The three component schema architecture proposed by ANSI/SPARC is as given below: External sche
Economics: It is now usually accepted that it costs less to make a system of smaller computers with the equivalent power of a one large computer. It is more cost-effective to get s
What are the various forms of data transparency? a) fragmentation transparency b) replication transparency c) location transparency
Define the terms 1) physical schema 2) logical schema. Physical schema: The physical schema explains the database design at the physical level, which is the lowest level of abs
In a relational model how relations are termed? In a relational model, relations are termed as tables. (The term ‘relation’ is the technical name of the ‘table’ in RDBMS)
What is Relational calculus? Relational calculus is a Non- Procedural language.
What was the method in which records are physically stored in a specified order according to a key field in each record ? A method in which records are physically stored within
A Relation Schema represented by R(A1, A2, ..., An) is made up of the relation name the list of attributes and R Ai that it contains. A relation is described as a set of tuples
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