这里有两种表数据复制语句：
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
这里由于目标表table2已经存在，所以我们除了插入源表table1的字段外，还可以插入常量
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
这里在插入时会自动创建表table2，并将table1中指定字段数据复制到table2中
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