Question

我目前的项目是从下表中生成一份支出报告。完整的报告是显示用户按特许经营的零售类别（例如

）消费的细分

用户1

retail_category 1：$ 20

retail_category 2：30美元

retail_category 3：35美元

用户2

retail_category 1：$ 10

retail_category 2：$ 15

retail_category 3：$ 5

以下是表格：

class User(models.Model):
    id_user = models.AutoField(primary_key = True)

class Franchises(models.Model):
    id_franchise = models.AutoField(primary_key=True)
    retail_category = models.IntegerField(default=99)  # values are 1 to 13

class Stores(models.Model):
    id_store = models.AutoField(primary_key=True)
    franchise = models.ForeignKey(Franchises, db_column='id_franchise')

class Receipts(models.Model):
    id_receipt = models.AutoField(primary_key=True)
    store = models.ForeignKey(Stores, db_column='id_store')
    user = models.ForeignKey(User, db_column='id_user')
    grand_total = models.DecimalField(max_digits=19, decimal_places=4)

我很欣赏任何原始的mysql或django模型查询。谢谢，

Answer 1

希望我正在将你的django架构规范正确地翻译成原始的mysql：

SELECT user, retail_category, SUM(grand_total)
FROM Receipts
INNER JOIN Stores ON Receipts.store = Stores.id_store
INNER JOIN Franchises ON Stores.franchise = Franchises.id_franchise
GROUP BY user, retail_category;

从下表中生成支出报告

1 个答案: