Online Google Dictionary

cardinality 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/ˌkärdnˈalitē/,
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cardinalities, plural;
  1. The number of elements in a set or other grouping, as a property of that grouping

  1. (mathematics) the number of elements in a set or group (considered as a property of that grouping)
  2. In data modeling, the cardinality of one data table with respect to another data table is a critical aspect of database design. Relationships between data tables define cardinality when explaining how each table links to another.
  3. In SQL (Structured Query Language), the term cardinality refers to the uniqueness of data values contained in a particular column (attribute) of a database table. The lower the cardinality, the more duplicated elements in a column. ...
  4. Of a set, the number of elements it contains; The property of a relationship between a database table and another one, specifying whether it is one-to-one, one-to-many, many-to-one, or many-to-many
  5. The number of elements in the set; intuitively, the set's "size" or "magnitude". Notation: a double bar over the symbol denoting the set; also "|S|" and "card S" when S is the symbol denoting the set.
  6. A specification of a relationship’s multiplicity. Cardinality defines how many of the related class instances are expected to occur within a relationship.
  7. Maybe it means, quanity of numbers in a set/ got to do with math.--Betsyl 01:59, 14 October 2008 (UTC) Def: A principle specifying that the last word in a counting sequence indicates the quanity of items in a set.(Child Development Book --209.215.27.212 21:09, 19 October 2008 (UTC)
  8. A constraint on the number of instances of assigned property values associated with an individual data item. A cardinality of 1 indicates exactly one value is required; 0..1 indicates an optional single value; 1..n indicates that one or more values is required; 0.. ...
  9. A slot facet that describes whether the slot has just one value (single) or more than one value (multiple). In Protégé-2000, Single is the default.
  10. a description of the association between data entities as either mandatory or optional.
  11. The number of instances of entity B that can (or must) be associated with each instance of entity A. (10)
  12. A business rule specifying how many times (minimum and maximum) and entity can be related to another entity in a given relationship.
  13. Number of entities that are involved in a relationship.
  14. The number of lines in a dependent table to which the table under consideration, in principle, can or must relate. A line in a table may be related to another dependent line in a cardinality of one-to-one correspondence. ...