Database command line operation
Command line operation of the database,
[if exists]
can be added from time to increase, the command line must add a semicolon;
at the end
Create a database: create database [if not exists] database name;
create database if not exists test;
Delete the database: drop database [if exists] database name;
drop database if exists test;
View the database: show databases;
show databases;
Use database: use database name;
use test;