Cardinality Estimation in SQL Server – SQLServerCentral The first factor, cardinality, is used as an input parameter of the second factor, the cost model Therefore, improved cardinality leads to better estimated costs and, in turn, faster execution plans
离散数学中为什么同一个概念有多个名字？ - 知乎 于是我默默搜了搜这俩词，它们应该分别叫Cardinal number和Cardinality。 所以问题是这样的，它们在英语里本来就是两个很近的概念，Set A and set B have the same cardinality Set A has a cardinality of 3 The cardinal number of set B is also 3 所以可以看到，基本上这两个词只是语法上的变化。 但是也不完全是，因为Cardinal