SQL开发知识：C# ling to sql 取多条记录最大时间

var _setList = (from f in _postgreDbContext.settlements
group f by ( new { f.settlement_code })into g
select new
{
deal_time = g.Max(m => m.deal_time),
g.Key.settlement_code
}).AsNoTracking().ToList();

2012-05-31 C001 A店 136.00
2012-05-29 C001 A店 139.00
2012-05-29 C001 B店 5.00
2012-05-30 C001 B店 6.00

select * from tb t where not exists ( select 1 from tb where 编号 = t.编号 and 仓库 = t.仓库 and 日期 > t.日期)

create table cangku ( F_RQ datetime, F_BH VARCHAR(20), F_SL FLOAT )

INSERT INTO cangku VALUES(‘2012-05-31′,’C001’,343) INSERT INTO cangku VALUES(‘2012-05-30′,’C001’,34) INSERT INTO cangku VALUES(‘2012-05-30′,’C002’,33) INSERT INTO cangku VALUES(‘2012-05-26′,’C002’,23)

SELECT * FROM cangku T,(SELECT F_BH,MAX(F_RQ) rq FROM cangku GROUP BY F_BH) t2 where t.F_BH=t2.F_BH and t.F_RQ>=t2.rq

select * from table a where a.date in (select max(b.date) from table b where b.id=a.id)