NDV：非重复值的数目

英文缩写词NDV的例句

1. Statistics about individual columns such as he number of distinct values in a column.
2. 有关单个列的统计信息，比如一列中唯一值的数量。
3. To achieve this goal, the partitioning key should be selected on the columns that have high cardinality, or in other words, that contain a large number of distinct values.
4. 为了实现此目标，分区键应该在具有较高基数（换言之，即包含大量不同值）的列上选择。
5. The large number of distinct values in the pdb_id column ensures a relatively even distribution of rows over the database partitions.
6. pdbid列中各异的值数量很大，这就确保了跨数据库分区可以获得相对均衡的行分布。
7. The number of distinct values must be great enough to ensure an even distribution of rows across all database partitions in the database partition group.
8. distinct值的数量必须多到足以确保数据行均匀地分布在数据库分区组中的所有数据库分区上。
9. All the information like the levels of B-tree index, number of pages consumed by the table, number of distinct values of a column are stored.
10. 这种模式存储诸如B-树索引的级数、表所占用的页数、一个列中不同值的数量之类的信息。