Desafio banco de dados Hugo #5
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vueda
approved these changes
Feb 7, 2022
| `DATA_DE_PUBLICACAO` DATE NULL, | ||
| `QUANTIDADE_DE_PAGINA` INT NULL, | ||
| `IDIOMA` ENUM('PORTUGUES', 'INGLES', 'ESPANHOL') NOT NULL, | ||
| `AUTOR_KEY` BIGINT NOT NULL NULL, |
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O livro pode ter mais de um autor. Isso poderia ser feito com uma tabela tipo LIVRO_AUTOR por exemplo.
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| -- Insert Tabale Autoria | |||
| INSERT INTO `AUTOR` VALUES (null,'Furgeri', ' Bates', '2000-08-25' ); | |||
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Em insert geralmente é bom definir os nomes das colunas pra evitar problema caso alguma coisa afete a ordem. Tipo INSERT INTO MINHA_TABELA(ID, NOME) VALUES (1,2)
| FROM EMPRESTIMO EM | ||
| INNER JOIN LIVRO LI ON EM.ISBN = LI.ISBN | ||
| Where EM.DATA_DE_RETIRADA | ||
| BETWEEN TIMESTAMP(DATE_SUB('2020-10-01', INTERVAL 7 day)) AND '2020-10-01' |
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Dá pra fazer um DATA_DE_RETIRADA >= (NOW() - INTERVAL 7 DAY) pra pegar sempre os últimos 7 dias.
| order by EM.DATA_DE_RETIRADA ASC; | ||
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| -- Todos os livros que contém a palavra 'java' na descrição (Independente de maiúsculas ou minúsculas). | ||
| SELECT TITULO AS LIVRO FROM LIVRO WHERE TITULO LIKE '%java%'; |
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É bom fazer um lower(titulo) porque o comportamento aqui pode ser diferente de acordo com o banco de dados. Com o lower você garante que vai estar sempre comparando no mínusculo.
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