... 1. partition-clause 数据记录集分组 2. order-by-clause 数据记录集排序 --Partition by ，按相应的值 (manager_id) 进行分组统计 ...
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order by clause 次序子句
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。
These operator choices provide further sorting control and accompany a given column in the ORDER BY clause.
这些操作符选择提供进一步的排序控制，伴随着ORDER BY子句中的给定列出现。
Support for constants in ORDER BY clause have been depreciated.
支持ORDER BY子句中使用常量已经过时。
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