使用 SQL 或 Linq to Object 重构表/实体

Question

我正在尝试将包含名称列名称的表 A 规范化，其中名称由“/”连接并分隔到表 B 中，其中名称被拆分为行，状态被复制到新行中。我用谷歌搜索并尝试了没有成功，请帮忙。

表-A

Name	State
Ken/Terri/Roberto	New York
David/Ken	Chicago
Kevin/John/Mary	New Jersey

表-B

Name	State
Ken	New York
Terri	New York
Roberto	New York
David	Chicago
Ken	Chicago
Kevin	New Jersey
John	New Jersey
Mary	New Jersey

Answer 1

您可以使用SelectMany()、Select() 和Split() 的组合

输入

var tableA = new []
{
    new {Name = "Ken/Terri/Roberto", State = "New York"},
    new {Name = "David/Ken", State = "New York"},
    new {Name = "Kevin/John/Mary", State = "New York"}
};

Linq

var result = tableA.SelectMany(x =>   //Flatten the given sequence
       x.Name.Split('/')              //Split each name by '/'
      .Select(y => new {Name = y, State = x.State}));  //Create Anonymous object for each name

Try it Online