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minimum no. of tables required....!!!

How to do such question where aggregation generalization or specialization is involved

in Databases 158 views

3 Answers

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according to me it should be 5
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normally we require 3 tables for IS-A relationship

if covering constraint is there (if both Engineer and Manager  collectively represent whole employees ) then only 2 tables are sufficient. which are one for engineer and another for manager  and same logic apply further
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It's M:N relation so that ...we have maintain one separate column for RELATION TABLE and 1 TABLE FOR ENTITY E1 and 1 TABLE FOR E2

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