entity-framework-4.1 - EF4.1 和左外连接查找空值？

Question

我有两张桌子，地址和人员。人们有 FK 要寻址。我试图找到没有人的地址：

select id from Address a 
left outer join person p on p.address_id = a.id
where p.address_id is null

这可能使用 LINQ to Entities 吗？我尝试了一些变化

 var results = from addr in _context.Addresses
               from ppl in addr.People
               where ppl == null ...

但似乎无法弄清楚如何返回没有人的地址。

Answer 1

我提议：

var results = (from addr in _context.Addresses
               where !addr.People.Any()
               select addr).ToList();