单项选择题
下列那一条语句可以实现快速的复制一张数据库表()
A.select *into b from a where 1< >1;B.creat table b as select *from a where 0=1;C.insert into b as select *from a where 1< >1;D.insert into b select *from a where 1< >1;
单项选择题 int 类型占用()个字节?
单项选择题 String a =new String(“1”+”2”)最终创建了几个对象()
单项选择题 log4j 的优先级从高到低的排序为()