Basic operations of MySQL database (I) --- Based on Database

1. Create database

create database + Database name ;

for example ： I need to create test1 database , The specific operation and results are shown in the figure below

2. Display database

（1） Show all databases

show databases;

for example ： I need to display all databases , The specific operation and display results are as follows

（ Be careful ：information_schema、mysql、performanse_schema、sys These three libraries come with the system ,test1、db1 These two libraries are the ones I created .）

(2) Display the specified database

show create database + Library name ;

for example ： Show specific test1 library , The specific operation and results are as follows

 3. Select database

use + Library name ;

for example ： The library I need to select is test1, Then the specific operation and results are as follows

4. Delete database  

drop database + Library name ;

for example ： The database I need to delete is db1, Then the actual operation and results are as follows

5. Change database name

alter database + name + Options ;// Because this command can only be used on the old version , So I won't show it here