A similar technique is used when applying the unique filter to the outer query, with dot notation used to indicate the field by which results are to be filtered.
在对外部查询应用惟一筛选器时可使用类似的技术，点符号将用于说明筛选结果所依据的字段。
A similar technique is used when applying the unique filter to the outer query, with dot notation used to indicate the field by which results are to be filtered.
在对外部查询应用惟一筛选器时可使用类似的技术，点符号将用于说明筛选结果所依据的字段。
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