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Analise as afirmativas que apresentam as características do modelo relacional.
I. A restrição de integridade de entidade afirma que nenhum valor de chave primária pode ser NULL.
II. A restrição de integridade referencial é especificada entre duas relações e usada para manter a consistência entre tuplas nas duas relações.
III. A restrição funcional estabelece um relacionamento funcional entre dois conjuntos de atributos X e Y.
IV. A restrição de integridade referencial não pode ser especificada entre duas relações e ser usada para manter a consistência entre tuplas nas duas relações.
V. As restrições de chave e as restrições de integridade são especificadas sobre as relações individuais.
Estão corretas apenas as afirmativas.
NÃO apresenta característica do modelo relacional.
Is computer shopping the way of the future? About 37% of American households now have personal computers. And shopping by computer (or “shopping on-line") is interesting to more people every day. Already, shoppers can use their computers to order many different products, such as computer products, flowers, food, T-shirts, and posters. And new on-line shopping services appear every day. Soon people may be able to shop for anything, anytime, anywhere in the world.
(Richards, Jack C. New Interchange 1. Cambridge University Press, 2000)
Which of the products can be acquired by computer, according to the text?
Is computer shopping the way of the future? About 37% of American households now have personal computers. And shopping by computer (or “shopping on-line") is interesting to more people every day. Already, shoppers can use their computers to order many different products, such as computer products, flowers, food, T-shirts, and posters. And new on-line shopping services appear every day. Soon people may be able to shop for anything, anytime, anywhere in the world.
(Richards, Jack C. New Interchange 1. Cambridge University Press, 2000)
It is correct about the text that.
1. Banking account.
2. Savings account.
3. Interests.
4. Profit.
5. Fine.
( ) Ammount of money that must be paid as a penalty.
( ) Income and expenses assigned to a person, business in a bank.
( ) A banking account to supply money for future use.
( ) Money made after all expenses are paid.
( ) Money a lender charges to someone who borrows money
Mark the option with the right sequence.