duplicate value造句
例句与造句
- in this scenario, if the user clicks a node that has a duplicate value, the node that appears first in the
在这种情况下，如果用户单击具有重复值的节点，则会选择 - second, if the system clock is adjusted backwards, generate unique will return duplicate values
第二，一旦系统时钟需要向后调整，那么generate_unique()将可能返回重复的值。 - creates a simple index on a table . when the unique keyword is omitted, duplicate values are allowed
给一个表建立索引而没有加上unique关键字，那么它所包含的数据值是可以出现重复的。 - list accepts duplicate values . later in this section, you will add a method that will let you populate the
在本节的稍后部分，将添加一个方法，此方法使您能够填充“sourcelist”列表。 - create a unique constraint to ensure no duplicate values are entered in specific columns that do not participate in a primary key
创建唯一约束可确保在不参与主键的特定列中不输入重复值。 - It's difficult to find duplicate value in a sentence. 用duplicate value造句挺难的
- when a unique index exists, the database engine checks for duplicate values each time data is added by a insert operations
如果存在唯一索引，数据库引擎会在每次插入操作添加数据时检查重复值。 - if you update the data in the column so there are many duplicate values, the column is no longer an ideal candidate for use in a query
如果更新列中的数据后存在许多重复值，则该列不再是用于查询的理想候选列。 - a unique index ensures that the index key contains no duplicate values and therefore every row in the table or view is in some way unique
唯一索引确保索引键不包含重复的值，因此，表或视图中的每一行在某种程度上是唯一的。 - using a nonkey column in the subselect statement may result in the deletion of more than 10 rows if the specified column contains duplicate values
如果指定列包含重复的值，则在嵌套select语句中使用非键列可能会导致删除的行超过10个。 - the sql server 2005 database engine does not allow creating a unique index on columns that already include duplicate values, whether or not ignore dup key is set to on
无论ignore_dup_key是否设置为on，sqlserver2005数据库引擎都不允许为已包含重复值的列创建唯一索引。 - if a primary key constraint is added to a column that has duplicate values or allows for null values, the database engine returns an error and does not add the constraint
如果为具有重复值或允许有空值的列添加primarykey约束，则数据库引擎将返回一个错误并且不添加约束。 - the histogram specifies how many rows exactly match each interval value, how many rows fall within an interval, and a calculation of the density of values, or the incidence of duplicate values, within an interval
。直方图指定有多少行精确匹配每个间隔值，有多少行在间隔范围内，以及间隔中值的密度大小或重复值的发生率。 - in an index, the incidence of duplicate values . in a data file, a percentage that indicates how full a data page is . in analysis services, the percentage of cells that contain data in a multidimensional structure
可以在合并复制中使用的行筛选器，通过它可以基于系统函数host_name和/或suser_sname（或引用其中一个或两个系统函数的用户定义函数）限制复制到订阅服务器的数据。 - then the thesis further analyses some core techniques including the system of database, data warehouse and data mining and so on, and presents the frame of function of bank crm . the thesis puts its emphasis on the research on the data preprocessing of data warehouse, data copying, data cleansing, data integration and quality verifying included . finally the thesis discusses the key technology of data warehouse in bank crm-the cleansing of data of customers, and presents some methods of cleansing aiming at noisy values, missing values, conflicting values and duplicated values
本文在充分分析银行crm的需求的基础上，提出了基于数据仓库的银行crm系统的体系结构，并进一步分析了该体系结构中客户数据库系统、数据仓库、数据挖掘等核心技术组件的内涵，给出了银行crm系统的功能构架；重点研究了银行业务系统多年积累的客户数据向数据仓库迁移的预处理方法和过程，其过程包括数据复制、数据清洗转换、数据集成、质量检验和数据装载；最后讨论了银行crm系统应用数据仓库的关键技术：客户数据清洗，给出了针对噪声数据、空缺数据、不一致数据和重复数据的清洗方法。
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