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Adds a new db and updates README with concepts
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‎README.md‎

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# My SQL Playground
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## Relationships
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- As chaves estrangeiras são colunas em uma tabela que se referem a chaves primárias em outra tabela.
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- As _linking tables_ (tabelas intermediárias) são necessárias quando a relação é de `n:n`

‎relationships/Biblioteca.db‎

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