==========增删改==========
添加表数据:
1、insert into car values('','','','','');
2、insert into car(字段1,字段2,....) values(值1,值2,....);
3、insert into car set 字段1 = 值1,字段2 = 值2,...;
修改表数据:
update car set 字段1 = 值 where 字段2 = 值;
删除数据表:
delete from 表名 where 字段 = 值;