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Question	Answer
What is the logical query processing order of the followings clauses: SELECT, FROM, WHERE, GROUP BY, HAVING and ORDER BY	1. FROM 2. WHERE 3. GROUP BY 4. HAVING 5. SELECT 6. ORDER BY
What is a relation? Define the term!	A relation in the relational model is what SQL represents with a table. A relation has a heading and a body. The heading is a set of attributes (what SQL attempts to represent with columns), each of a given type. An attribute is identified by name and type name. The body is a set of tuples (what SQL attempts to represent with rows). Each tuple’s heading is the heading of the relation. Each value of each tuple’s attribute is of its respective type.

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	Created by João Vitor de Oliveira Carlos almost 6 years ago