>> show databases;
>>CREATE DATABASE bigdata; 创建
>> use bigdata;
>>drop database bigdata; 删除
>>create table bigdata.mytable(id int ,nane varchar(200)); 创建表
>>insert into bigdata.mytable(id,nane
)VALUES(1,'tom'); 插入数据
>>select * from bigdata.mytable where id=1;查询
>>update mytable set id=3,nane='test' where id=1 ;更新
>>DELETE from bigdata.mytable where id=1; 删除数据
>> drop table bigdata.mytable;删除表
>>mysql 不区分大小写
>>select nane,id from bigdata.mytable where nane like 'j%'; 模糊查询
>>
--根据cid求max(price)
select id,max(price) from ord GROUP BY cid order by id asc ;
--分组后进行过滤
select id,max(price) from ord GROUP BY cid having max(price)>10;
>>select * from t2 limit 3,10; 3表示跳过多少不要，10表示要多少。
>>select nane,id from bigdata.mytable where nane like '%t_'; _模糊匹配 t后面的单个字符
>>desc tablea;
>>create table t2 like t1;创建表结构 不含有数据
>>create table t2 as select * from t1;复制表结构含有数据
----cmd的下 netstat -ano 查看端口
--行转列的显示（仅限于显示相当于自动换行）
>>select * from ord G;