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copied!<p>You need a map-reduce index to do this. Here's a short console program that demonstrates:</p> <pre><code>using System; using System.Linq; using Raven.Client.Document; using Raven.Client.Indexes; namespace ConsoleApplication1 { public class Customer { public string Id { get; set; } public string Name { get; set; } public string City { get; set; } } public class Customers_ByCity : AbstractIndexCreationTask<Customer, Customers_ByCity.Result> { public Customers_ByCity() { Map = customers => from customer in customers select new { customer.City, Count = 1 }; Reduce = results => from result in results group result by result.City into g select new { City = g.Key, Count = g.Sum(x => x.Count) }; } public class Result { public string City { get; set; } public int Count { get; set; } } } class Program { private static void Main() { var documentStore = new DocumentStore { Url = "http://localhost:8080" }; documentStore.Initialize(); IndexCreation.CreateIndexes(typeof(Program).Assembly, documentStore); using (var session = documentStore.OpenSession()) { session.Store(new Customer { Name = "John", City = "NY" }); session.Store(new Customer { Name = "Jane", City = "NY" }); session.Store(new Customer { Name = "Jim", City = "NY" }); session.Store(new Customer { Name = "Sally", City = "LA" }); session.Store(new Customer { Name = "Sam", City = "LA" }); session.Store(new Customer { Name = "Suzie", City = "LA" }); session.Store(new Customer { Name = "Sarah", City = "LA" }); session.SaveChanges(); } using (var session = documentStore.OpenSession()) { // In a real app, you probably don't want to wait for nonstale results. // You will also want to consider what to do if you have more than one page of results (more than 1024 cities) var counts = session.Query<Customers_ByCity.Result, Customers_ByCity>() .Customize(x=> x.WaitForNonStaleResults()) .Take(1024); foreach (var result in counts) { Console.WriteLine("{0}: {1}", result.City, result.Count); } Console.WriteLine(); } Console.ReadLine(); } } } </code></pre>

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