摘要:
int i =10;object obj=i;int j=obj;显然第三句不对。The error message form Visual Studio is : Cannot implicitly convert type 'object' to 'int'.不惜进行强制转换才能通过编译。int j=(int) obj; 阅读全文
摘要:
select top 10 * from [Northwind].[dbo].[Orders] where OrderID NOT IN(SELECT top 20 OrderID from [Northwind].[dbo].[Orders] order by OrderID )order by OrderIDselect top 10 *from [Northwind].[dbo].[Orders] where OrderID >(selectISNULL(MAX(OrderID),0)FROM(selecttop 20 OrderID from [Northwind].[dbo]. 阅读全文