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Chaves Primaria e Chaves Estrangeiras

Pizero Infor


Ola galera..!!

Tenho uma grande duvida referente a Chaves Primaria e Chaves Estrangeiras...! A pergunta é o que é Chaves Primaria e Chaves Estrageira..!!

Como cria-las e como trabalhar com as mesma e qual a finalidade da utilização dessa duas chaves..!!

qual o codigo para criar as duas..!!

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