Question

您可以在一个查询中进行多个查询。我有一个相同的表，不同的地方和多个选择总和：错误的代码：

    public Cursor listado_resumen(String s_mes, String s_ano) {
    String s_actual = "-" + s_mes + "-" + s_ano;
    String s_actual_ano = "-" + s_ano;
    String lista_re = "SELECT *, (SELECT SUM (tr_euros) FROM bdt_registro WHERE tr_fecha LIKE '_%" + s_actual_ano + "' GROUP BY tr_codigo ORDER BY tr_codigo) AS total, (SELECT SUM (tr_euros) FROM bdt_registro WHERE tr_fecha LIKE '_%" + s_actual + "' GROUP BY tr_codigo ORDER BY tr_codigo) AS actual FROM bdt_registro GROUP BY tr_codigo ORDER BY tr_codigo";        
    return db.rawQuery(lista_re, null);
}

返回：
只有第一个值

cod。|| descrip || total || actual（month）

a || house || 100 || 100
b || car || 100 || 100
c ||食物|| 100 || 100

我喜欢回报：
cod。|| descrip || total || actual（month）
a || house || 100 || 20个
b || car || 20 || 5
c ||食物|| 5 || 0

感谢您的关注

Answer 1

标量子查询必须只返回一个值。（SQLite忽略任何其他值;其他数据库可能会报告错误。）

您必须编写子查询，以便它们为外部表中的相应记录返回正确的值，即它们必须是相关的子查询（我假设tr_codigo值可用于关联）：

SELECT *,
       (SELECT SUM (tr_euros)
        FROM bdt_registro AS r1
        WHERE tr_fecha LIKE '_%...'
          AND r1.tr_codigo = bdt_registro.tr_codigo
       ) AS total,
       (SELECT SUM (tr_euros)
        FROM bdt_registro AS r2
        WHERE tr_fecha LIKE '_%...'
          AND r2.tr_codigo = bdt_registro.tr_codigo
       ) AS actual
FROM bdt_registro
GROUP BY tr_codigo
ORDER BY tr_codigo

sqlite选择sum多个不同的where和same table

1 个答案: