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Guest Pedro Menoncin

Como Funciona Função Sum() Em Mysql?

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Guest Pedro Menoncin

Olá,

me disseram que usando a funçao SUM() do mysql ele retorna uma somatoria de numeros:

50+10+20+30=110

no caso, mesmo se tiver numeros positivos e negativos ele retorna o saldo?

qual a sintaxe?

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Ele funciona da seguinte maneira :

select sum( campo ) from tabela.

O bom desta função é que ele pega somente os numeros positivos, então já vem descontado os negativos

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