What are the technique to define a schema completely, Database Management System

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What are the technique to define a schema completely ?

A schema is completely define by DDL and DML query language.

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Relational schema for person, Example: RELATIONAL SCHEMA for PERSON: ...

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What is Nested Queries explain in details? Nested Queries - A SELECT query could have subquery(s) in it. While a SELECT query having another SELECT query in it, is known as n

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