单词：unique index
unique index的用法和样例：
例句
- Creating a unique index guarantees that any attempt to duplicate key values fails.创建唯一索引可以确保任何生成重复键值的尝试都会失败。
- Always select the smallest unique index available for your full-text unique key.始终选择可用于全文唯一键的最小唯一索引。
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