Linq Sql

1.日期比较

var query = from order in dbContext.OrderTBs
where subProxyIDs.Contains(order.ProxyID)
&& firstDayOfPreviousMonth <= EntityFunctions.TruncateTime(order.FinishTime)
&& lastDayOfPrdviousMonth >= EntityFunctions.TruncateTime(order.FinishTime)
&& order.Status==(int)OrderStatus.Finished
select order
;

2.Group By

var query= from order in queryOrderList
group order by order.ProxyID
into g
where g.Sum(u => u.Num) >= 5
select g.Key
;

等价于

select t2.ProxyID from (
select sum(Num) num,t.ProxyID from OrderTBs t GROUP BY t.ProxyID
) t2
where t2.num>5

3.Group By having

待补充

Linq Sql

原文：http://www.cnblogs.com/liandy0906/p/7155023.html