从数据库中删除数据 delete 

插入数据 insert into

创建新数据库 create database

修改数据库  alter database

创建新表    create table

变更数据库表 alter table

删除表
drop table

创建索引     create index

删除索引     drop index

查找所有列   select * from table

查找列中不同值 select distinct name from table

select * from table where city = ‘beijing’

order by 字段名 默认升序(desc 降序)

update person set address = ‘zhengzhou’, city = ‘beijing’ where lastName =  ‘xiaocao’

delete from person where lastName = ‘xiaocao’

select * from persons where lastName in(‘adms’,’carter’);

select column_name(s) from table_name where column_name between value1 and value2