E-R MODEL, Database Management System

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WHAT IS MEANT BY E-R MODEL

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Improved Reliability: In a centralised DBMS, a server failure stops the operations of the DBMS. Though, a failure at single site of a DDBMS, or a failure of a communication link cr

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These are the binary operations; i.e., each is applied to two relations or sets. These two relations can be union compatible excluding in case of Cartesian product. Two relations R

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List the SQL domain Types? SQL supports the following domain types. 1) Char(n) 2) varchar(n) 3) int 4) numeric(p,d) 5) float(n) 6) date.

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What is Message switching Message switching transmits data units which can be arbitrarily long. Packet switching has a utmost packet size, if any message longer than that, it s

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What are the types of storage devices? Primary storage Secondary storage Tertiary storage Volatile storage Nonvolatile storage

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For the relations R and S given below: R                      S A B C 1 4 7 2 5 8 3 6 9

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