insert into select批量复制表
1.INSERT INTO SELECT语句
??????语句形式为：Insert into Table2(field1,field2,...) select value1,value2,... from Table1
????? 要求目标表Table2必须存在
2.SELECT INTO FROM语句
??????语句形式为：SELECT vale1, value2 into Table2 from Table1
????? 要求目标表Table2不存在
