增加记录：注：null关键字与auto_increment限制条件相结合，可以为字段自动赋值；字段必须全，且一一对应；字符型用单引号；1 mysql> insert into test values('sunshine_habit','hello_world_lyq@163'2 -> ,1558888888,null);输出：3 Query OK, 1 row affected (0.10 sec)查询记录：1 mysql> select * from test where name='sunshine_habit';2 输出：3 +----------------+-------------------------+--------------+----+4 | name | email | phone_number | id |5 +----------------+-------------------------+--------------+----+6 | sunshine_habit | hello_world_lyq@163 | 1558888888 | 1 |7 +----------------+-------------------------+--------------+----+8 1 row in set (0.00 sec)修改记录：1 mysql> update test set name='Sam' where name='sunshine';输出：2 Query OK, 1 row affected (0.06 sec)3 Rows matched: 1 Changed: 1 Warnings: 0删除记录1 mysql> delete from test where name='Snow White';2 Query OK, 1 row affected (0.08 sec)