Unique Index

常见例句

The primary key and any unique index of the table must be a superset of the associated partitioning key.
表的主键和所有惟一索引都必须是相关分区键的超集。
On a federated system, unique index information might be required to perform an UPDATE/DELETE operation for some data sources.
在一个联邦系统上，为了为某些数据源执行 UPDATE/DELETE 操作，需要惟一的索引信息。
In other words, all columns that are part of the partitioning key must be present in the primary key or unique index definition.
换句话说，作为分区键一部分的所有列都必须出现在主键或惟一索引定义中。

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