(1)、数据插入insert
语法：insert into 表名 (字段名称1, 字段名称2,n,)values('值1'，'值2'，'值3')
举例说明:
create table gonda(
user_id int,
user_name varchar(15),
old int,
address varchar(50));
标准数据插入：
 insert into gonda(user_id,user_name,old,address)
 values('111','alvin','2000','gongdahanshuiliyuan');
 非标准数据插入
 insert into gonda values('110','zhangsan','200','asdfdfsdf');
 
 同时插入多条数据
insert into gonda values('110','zhangsan','200','asdfdfsdf'),
('113,'lisi','300','aaaaa'),
('114,'lisi','300','aaaaa'),
('116,'lisi','300','aaaaa'),
('118,'lisi','300','aaaaa');

(2)、更新数据update
语法：update 表名
set 字段名称1=值1,字段名称2=取值2.....
where 条件表达式(必须的)
举例说明：
更改单个值
update gonda set old=500 where user_id=110;
更改多个值
update gonda set user_name='glvin',old='1000' where user_id=111;

(3)、删除数据delete
语法:delete from 表名 where 条件表达式
举例说明:
delete from gonda where user_id=110;