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Anderson Dos Santos Salgado

Consulta com soma entre 2 tabelas Mysql


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Tente assim:

SELECT r1.ano_mes, r1.total_receitas, d1.total_despesas, (r1.total_receitas - d1.total_despesas) AS saldo
   SELECT SUBSTRING(r.data, 1, 7) AS ano_mes, SUM(r.receitas) AS total_receitas
   FROM receitas r
   GROUP BY SUBSTRING(r.data, 1, 7)
   SELECT SUBSTRING(d.data, 1, 7) AS ano_mes, SUM(r.despesas) AS total_despesas
   FROM despesas d
   GROUP BY SUBSTRING(d.data, 1, 7)
)d1 ON d1.ano_mes = r1.ano_mes

Tenha cuidado para não executar esta select com um período grande ou com um número elevado de registros, pois, por não conter índices em ano_mes, sempre executará por TABLE SCAN.

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