摘要：
子查询描述：查询订单数超过5的顾客信息查询句法：var 子查询 = from c in ctx.Customers where (from o in ctx.Orders group o by o.CustomerID into o where o.Count() > 5 select o.Key).Contains(c.CustomerID) select c; in 操作描述：查询指定城市中的客户查询句法：var in操作 = from c in ctx.Customers... 阅读全文
