Question: DATABASE SYSTEMS 1.Explain the difference between a Catalogue, a Schema, and a Relation in the SQL DDL. 2.What is a possible advantage of declaring a

DATABASE SYSTEMS

1.Explain the difference between a Catalogue, a Schema, and a Relation in the SQL DDL.

2.What is a possible advantage of declaring a DOMAIN in SQL?

3.How are the CONSTRAINT keyword and the CHECK keyword used differently in SQL?

4.Name one example in which aliasing of relations is necessary (instead of just convenient or

good practice)

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