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What are the main differences functions - wise between SQL and an RDBMS ? The relationship between a database and an information system? How does

What are the main differences functions $-$ wise between SQL and an RDBMS $?$ The relationship between a database and an information system? How does this relationship have a bearing on database design? When do we have the recourse to using sub $-$ queries? How are they executed?Illustrate your answers using one or more practical examples.

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