How to improve performance of Non selective Index?
如何提高非选择性指数绩效？
Focused on the yield, this paper analyzes the genetic parameters of 15 characters and selective index of yield for 7 varieties of Flos Magnolia.
以产量为中心，对7个辛夷品种15个性状的遗传参数作了测定，并分析了产量选择指标，建立了产量选择指数。
The researches about the classification and identification of their species and varieties have provided an early, subservient and selective index for breeding work.
其种间或品种间的分类鉴定和亲缘关系的研究为育种工作提供了一个早期的、辅助的、选择性的指标。
The table is logically joined to itself, and the more selective non-leading index keys are applied as index bound filters to each unique combination of the leading key values.
首先在逻辑上将表与其自身连接，然后将更具有选择性的非起始索引键作为索引绑定过滤器，应用于起始键值的每个惟一的组合。
When a join is executed that incorporates an index that is selective, any column in the dimension table can be used.
当连接执行时，合并选中的索引，此时维度表中的任何列都可使用。
Correlated subqueries will greatly degrade the speed of data retrieval, especially for non-selective queries on huge tables with millions of rows and with no index.
相关子查询将极大地降低数据检索的速度，对于拥有几百万个行但没有索引的大型表的非选择性查询更是如此。
By contrast, an index that is not selective is not as useful.
与之相比，选择性低的索引就不那么有用了。
In this article, some principles of selective evaluation index, selective method of fixed quantity index and quantization method of qualitative index have been introduced.
介绍评价指标选取得一般原则，定量指标的筛选方法，以及如何对定性指标进行量化。
In this article, some principles of selective evaluation index, selective method of fixed quantity index and quantization method of qualitative index have been introduced.
介绍评价指标选取得一般原则，定量指标的筛选方法，以及如何对定性指标进行量化。
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