问题一 解释在 Power BI 中星型模式（Star Schema）和雪花模式（Snowflake Schema）之间的区别。 星型模式是一种数据建模方法，其中一个中央事实表包含了数字性能指标（例如销售额、收入），周围是描述数据的维度表（例如日期、产品、客户）。在提供的代码片段中，我们从销售表中选择特定列来创建一个简化的星型模式。

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