Next, ensure that the index has these columns in the proper sequence (according to the ORDER BY clause), so that a sort can be avoided.

接下来，确保索引中这些列有适当的顺序(按照ORDER by子句)，这样可以避免排序。

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The pseudo column LEVEL can be used in the ORDER BY clause to return the result set in search breadth first sequence.

可在 ORDER BY 子句中使用伪列 LEVEL 按照搜索宽度优先顺序返回结果集。

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Adding an ORDER siblings BY clause which is only allowed in composition with the hierarchical query clause and will return the siblings in the predefined sequence.

添加一个ORDER SIBLINGS BY子句，该子句只能与分级查询子句组合使用，并且将按预先定义的顺序返回同级查询结果。

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SmartBook represents a breakthrough achievement in reading, as it breaks the centuries-old tradition of books as linear experiences that presume to be read in their entirety, and in a pre-defined sequence, in order to be understood.

ENGADGET: McGraw-Hill reveals the SmartBook: an 'adaptive' e-book for students

The first step is to sequence the patient's DNA in order to uncover the cancer-causing mutation.

CNN: Is personalized medicine a myth?