লক্ষ্য করুন: এই এন্ট্রির অনুবাদ বর্তমানে মান পর্যালোচনার অধীনে রয়েছে, তাই কিছু বিষয়বস্তু সাময়িকভাবে শুধুমাত্র ইংরেজিতে প্রদর্শিত হচ্ছে।
এই এন্ট্রিটি এখনও আপনার ভাষায় অনুবাদ করা হয়নি, তাই নিচে মূল লেখাটি দেখানো হচ্ছে।
cardinality
This term is primarily used in mathematics and computer science to describe the size of a set or the uniqueness of data. It carries a technical, precise connotation, focusing on the quantitative property of a collection rather than its qualitative characteristics.
In database management, the term shifts slightly to describe the distribution of values. High cardinality indicates a high proportion of unique values, whereas low cardinality suggests many repeating values. This distinction is critical for indexing and query optimization in technical environments.
Meanings
Examples
The cardinality of a finite set is simply the number of elements it contains.
We need to check the cardinality of this column before choosing an index.
Does the set of real numbers have a greater cardinality than the set of integers?
Low cardinality means there are very few unique values in the data set.
I wonder if two infinite sets can have the same cardinality.
The database administrator noted that the cardinality of the gender column is very low.
To compare these two groups, we first determine their cardinality.
High cardinality columns are generally more efficient for filtering results.