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In contemporary databases, the top level of the hierarchy consists of ______ each of which can contain _____

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In contemporary databases, the top level of the hierarchy consists of ______ each of which can contain _____

(a) Catalogs, schemas

(b) Schemas, catalogs

(c) Environment, schemas

(d) Schemas, Environment

This question was addressed to me in a job interview.

Enquiry is from SQL Data Types and Schemas topic in division SQL : Queries, Constraints and Triggers of Database Management

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Correct choice is (a) Catalogs, schemas

Easy explanation - None.

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