8.MySQL用查找的方法直接新增数据

mysql> create table user (id int primary key auto_increment,name varchar(20),decription varchar(1000));

mysql> insert into user values(null,'曹操','乱世枭雄');
Query OK, 1 row affected (0.04 sec)

mysql> insert into user values(null,'刘备','仁德之主');
Query OK, 1 row affected (0.00 sec)

mysql> insert into user values(null,'孙权','年轻有为');
Query OK, 1 row affected (0.00 sec)

mysql> create table user2(name varchar(20),decription varchar(1000));
Query OK, 0 rows affected (0.06 sec)

mysql> insert into user2 select name,decription from user;
Query OK, 3 rows affected (0.04 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> select name,decription from user;
+--------+--------------+
| name   | decription   |
+--------+--------------+
| 曹操   | 乱世枭雄     |
| 刘备   | 仁德之主     |
| 孙权   | 年轻有为     |
+--------+--------------+
3 rows in set (0.00 sec)