day1_install and build database and table

 #First database and table 
create database library; 
use library; 

create table book ( 
  id int primary key , book_name char (50 )  ); 
 create table reader (id int primary key , reader_name char (50 ));

1. The installation uses the virtual machine Ubuntu16.04 LTS;

2. MySQL syntax is not case sensitive, and the end with a semicolon ";" indicates the end of a statement, and the carriage return represents a line feed;

3. Statements such as int (10) are 10 characters, not bytes;

4. Basic statement:

　　create database <database name>;

　　use <database name>;

　　show databases;

   　create table<表名>；　

　　insert into employee(id,name,phone) values(01,'Tom',110110110);

　　insert into employee values(02,'Jack',119119119);

　　insert into employee(id,name) values(03,'Rose');