cardinality

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UK [kɑːdɪ'nælɪtɪ]
  • n.〔数〕基数
  • Web基数性；势；基数或势

E-C

Web Definition

n.
1.
〔数〕基数

Sample Sentence

Definition:
AllAll,〔数〕基数〔数〕基数,基数性基数性,势势,基数或势基数或势
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard
1.
Call a set of integers fat if each of its elements is at least as large as its cardinality.
称一个整数的集合为饱和的，如果它的每一个元素都至少不小于其基数。
chēng yī gè zhěng shù de jí hé wèi bǎo hé de , rú guǒ tā de měi yī gè yuán sù dōu zhì shǎo bù xiǎo yú qí jī shù 。
2.
You may have noticed that the query access plan itself did not change with the increase in cardinality estimate.
您可能已经注意到了，查询访问计划本身并未随着基数估计值的增大而改变。
nín kě néng yǐ jīng zhù yì dào le , chá xún fǎng wèn jì huà běn shēn bìng wèi suí zhe jī shù gū jì zhí de zēng dà ér gǎi biàn 。
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3.
The optimizer depends on accurate cardinality estimates to properly compute the cost of each query access plan considered.
优化器凭借精确的基数估计值来准确计算出每一个待定查询访问计划的成本。
yōu huà qì píng jiè jīng què de jī shù gū jì zhí lái zhǔn què jì suàn chū měi yī gè dāi dìng chá xún fǎng wèn jì huà de chéng běn 。
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4.
As mentioned, the cardinality of the address containment within a contact is assumed by the Relational DAS to be one-to-many.
刚才已经提到，联系人中地址包容的二元关系由关系型DAS假定为一对多的关系。
gāng cái yǐ jīng tí dào , lián xì rén zhōng dì zhǐ bāo róng de èr yuán guān xì yóu guān xi xíng DAS jiǎ dìng wèi yí duì duō de guān xì 。
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5.
Notice that there is a significant difference between the cardinality shown in the fetch node on the outer side of the join in Figure 7.
请注意在图7中联接的外部Fetch节点上所显示的基数之间有一个显著的不同。
qǐng zhù yì zài tú qī zhōng lián jiē de wài bù Fetch jié diǎn shàng suǒ xiǎn shì de jī shù zhī jiān yǒu yī gè xiǎn zhù de bù tóng 。
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6.
Generate the access plan and see what the optimizer estimates the total cardinality (Number of rows) returned by the query will be.
生成访问计划，查看优化器对该查询返回的总基数（行数）的估计值。
shēng chéng fǎng wèn jì huà , chá kàn yōu huà qì duì gāi chá xún fǎn huí de zǒng jī shù ( xíng shù ) de gū jì zhí 。
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7.
When examining an access plan, you may find that the estimated cardinality is not as accurate as it should be.
在分析访问计划时，可能会发现与集的基数不像希望的那样精确。
zài fēn xī fǎng wèn jì huà shí , kě néng huì fā xiàn yǔ jí de jī shù bù xiàng xī wàng de nà yàng jīng què 。
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8.
In real-life scenarios, typically the cardinality of an output structure in a message will mirror the cardinality of an input structure.
在真实的场景中，输出结构的基数通常等于输入结构的基数。
zài zhēn shí de chǎng jǐng zhōng , shū chū jié gòu de jī shù tōng cháng děng yú shū rù jié gòu de jī shù 。
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9.
Correlated subqueries are often used to test whether relationships exist without regard to cardinality.
相关性查询通常用于测试某种关系是否存在，而不管返回记录集的大小，
xiāng guān xìng chá xún tōng cháng yòng yú cè shì mǒu zhǒng guān xì shì fǒu cún zài , ér bù guǎn fǎn huí jì lù jí de dà xiǎo ,
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10.
Distinct cardinality is the number of distinct values in a column of a row set.
不同的行集数是在列行集上的不同的数值。
bù tóng de xíng jí shù shì zài liè xíng jí shàng de bù tóng de shù zhí 。
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