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Ans. Broad question, but if the company need velocity, think about use a NO SQL instead of regular SQL databases.
Also prefers materialized views instead of joins to fetch data quickly.
Regarding the database design, there are very good design tools for professional database (to develop proper indexes and good database design) one of the best is QuickDBD
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Ans. We can have 2 entities i.e EMPLOYEE and ADDRESS and can have a relationship Table , EMPLOYEE_ADDRESS having one to may relationship between the two.
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