给定一个表格
ID | Name | City
1 | X | Y
2 | Z | Y
3 | W | K
我想产生这样的结果
ID | Description
1 | Y (X, Z)
3 | K (W)
我试过类似的东西
From C In Clients Group C By C.ID, C.City _
Into G = Group Select New With {.ID = ID, .Description = City & _
" (" & (From C In Clients Select C.Name).Aggregate(Function(X, Y) X & ", " & Y) & ")"}
这给了我一个错误“不支持查询运算符‘聚合’。” 也试过
From C In Clients Group C By C.ID, C.City _
Into G = Group Select New With {.ID = ID, .Description = City & _
" (" & String.Join((From C In Clients Select C.Name).ToArray, ", ") & ")"}
这给了我错误“没有支持的 SQL 翻译”
那么,我该怎么做呢?
最佳答案
我用 C# 破解了它,它似乎可以满足您的需求。我会将 VB 的翻译留给您。
var clients = from c in context.Clients
group c by c.City into cities
select new {
ID = cities.First().ID,
City = cities.Key,
Names = string.Join(",", (from n in cities select n.Name).ToArray())
};
foreach (var c in clients) {
Console.WriteLine(string.Format("{0}| {1} ({2})", c.ID, c.City, c.Names));
}
关于c# - 在 linq to sql 查询中聚合或连接字符串 (SQL Server),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3427104/