FETCH：使用指定的记录标识符从表中读取列。

FETCH: Fetches columns from a table using a specific record identifier.

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这意味着该索引被禁止获得合格的记录标识符 (RID)。

This means that the index is traversed to obtain the qualifying record identifiers (RIDs).

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ID assignment (ID分配)—确保记录标识符正确构造并内部相关。

Id assignment - ensures that the record identifiers are properly constructed and inter-related.

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