May 16, 2012 · Could somebody explain to me, with the help of examples, what is cardinality in databases?

就可以得到任何集合 \left ( a,b \right) 和R都有相同的cardinality。 所以不能单一的定义cardinality为count。 纯手打修改了几次稍微完善了一点 才发现原来知乎像latex一样可以直接写公式form 阅读全 …

Aug 28, 2014 · High-cardinality - many tuples, low-cardinality - few tuples. While the Wikipedia article on Cardinality (SQL statements), defines it as follows: Cardinality refers to the uniqueness of data …

May 7, 2022 · When talking about data models and databases, the term Cardinality is often used to describe the number of allowed elements in a given set. UML often refers to the same property as …

Feb 24, 2011 · I am having a hard time understanding what is the difference between the Max and Min cardinalities when trying to design a database.

Dec 23, 2015 · The cardinality at the end of a line tells you for a given entity instance how many relationship instances/rows it can appear in. If a given instance/value doesn't have to appear in an …

Dec 2, 2014 · Cardinality is minimum and maximun number of entity occurrence associated with one occurrence of the related entity cardinality types as 1 to 1 , 1 to many , many to many. or min and …

Nov 18, 2024 · In my experience a prometheus server can easily handle in the order of 1000 servers sending 1000 metrics. That's about a million active time series. A prometheus server can get to 10 …

Jun 30, 2011 · Cardinality is the number of unique values for that field within the table. I suspect that SQL Server didn't actually create the index because there are no records for it. Is is possible this field …

Aug 3, 2010 · In database design what do n:m and 1:n mean? Does it have anything to do with keys or relationships?