更糟的是，您将检索到大量的冗余数据，因为在平展联接输出中，对于每个订单，每个客户将重复出现。
Even worse, you would be retrieving lots of redundant data as each customer repeats for each order in the flattened join output.
更糟的是，您将检索到大量的冗余数据，因为在平展联接输出中，对于每个订单，每个客户将重复出现。
Even worse, you would be retrieving lots of redundant data as each customer repeats for each order in the flattened join output.
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