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MOSS VALE is a town with 15000 inhabitants. The fire department wishes to develop a system that automates the despatch of fire engines to attend fires. The ERD below describes the
Define the terms i) DDL ii) DML DDL: Data base schema is specified by a set of definitions expressed by a special language known as a data def
Q. Describe how an ER schema can be represented by relation schemas and constraints arising from ER design can be mapped to constraints on a relation schema. The entity rela
WHAT IS MEANT BY E-R MODEL
A file of employee have 10,000 blocks on a cylinder of a disk with characteristics r=8ms and btt=0.6ms I want to know the cost of read inthe file under following conditions for a q
#question.explain diversity and magnitude of organic compounds and general properties?
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
how can apply joins on table
Discuss the types of integrity constraints in which must be checked for the update operations - Insert and Delete. Give examples. Insert operation can violet any of the subse
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