查找数据集中的项目数

Question

当试图找到一个单词在数据集中重复的次数时...例如，如果一列有East Northeast和West，我试图找到有多少东北有？

Answer 1

在Javascript中：

const column = ['east', 'west', 'northeast', 'west', 'northeast', 'south'];

const frequency = column.filter(word => word === 'northeast').length

此处frequency的值为2

Answer 2

SQL：

SELECT COUNT(column) FROM dataset WHERE column LIKE '%Northeast%'

C＃：

int count = dataSet.dataTable[0].AsEnumerable()
           .Count(row => row.Field<string>("Column-A") == "Northeast");