mysql 基础语法
登录 mysql -u root -p
显示库 show database
切换库 use databaseName
显示表 show tables
增 insert into table_name （field1,field2.....）values (value1,value2......)
删 delete from table_name where .....
改 update table_name set field1=value1,field2=value2.....
查 select * from table_name where .....
mysql 进阶
