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Aviso: Muitas vezes detalhes de várias operações podem variar de banco para banco. Em questões onde fiquei
em dúvida, este documento segue o funcionamento do PostgreSQL, pois é o banco que conheço melhor.
Pré-requisito: Álgebra Relacional básica
Antes de começar a escrever SQL, você precisa entender o modelo de
como um banco de dados relacional funciona. Não precisa se aprofundar
muito, mas você precisa entender como que dados e relacionamentos entre
eles são representados. (Nota importante: Relacionamento e relação não são a
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