但是，您可以在索引键的其余列上执行范围扫面。
But, you can perform range scans on the remaining columns in the index key.
因此，任意键通常可以更快地执行连接。
Therefore, arbitrary keys will generally perform joins faster.
使用键执行随机读操作的最常见rpg方法是CHAIN操作。
The most common RPG method for performing a random read using a key is the CHAIN operation.
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