朋友们,我有一个数据库,在那里我保持所有用户的流量。每天都在更新。我想每天数一次车流量。意思是:今天的交通-昨天的交通?select rem.remoteid, down.mazgas, down.portas, down.down, up.up, down.dateinner join dbo.down as down on down.mazgas=rem.mazgas and down.portas = rem.portas
inner join dbo.up as up on up.mazg