这要比关系数据库上的连接慢得多，因此很难创建一个让数据存储超负荷的查询。
They're considerably slower than a join on a relational database, but, as a result, it is much harder to create a query that overwhelms the data store.
这要比关系数据库上的连接慢得多，因此很难创建一个让数据存储超负荷的查询。
They're considerably slower than a join on a relational database, but, as a result, it is much harder to create a query that overwhelms the data store.
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