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Como subtrair valores do DB MySQL e efetuar o update


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Gostaria de saber uma maneira de subtrair o valor de uma tabela no DB.

Como se fosse uma baixa no estoque de produtos.

toda vez q o botao "COMPRAR" for acionado faça a baixa do produto usando PHP if(...){}

 

UPDATE usuarios SET creditos = creditos-1 WHERE id_usuario= '$id_usuario';

 

Obrigado!

Edited by Sali
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