declare @sql=N'SELECT TOP '+cast(@pageSize as varchar(50))+' * from (SELECT TOP ' +cast(@pageSize*@currentpage as varchar(50))+' * from [InMail] A ORDER BY A.id DESC) B ORDER BY B.id ASC' set @sql='SELECT from ('+@sql+') C ORDER BY C.id DESC'
select o_customer,o_price from orders having o_price >=avg(o_price) select o_customer,o_price from orders where o_price >=(select avg(o_price) from orders) 我感觉没有区别啊,怎么在mysql会有 ......