First, view information database
1, check the database version
Command: select @@ version;
example:
2, view the database state information
Command: status;
example:
3, view the current database connections
命令：show status like 'threads_connected';
example:
4, see the maximum number of current connections
命令：show variables like 'max_connections';
example:
5, view the default encoding information
命令：show variables like '%char%';
example:
6, view all existing database
Command: show databases;
example:
7, see coding information on a database
Command: show create database database name;
example:
8. Check the timeout, the delay time
命令：show variables like '%timeout%';
example:
9. Check the cache case
Command: show status like '% cache%';
example:
https://www.xiaohongshu.com/discovery/item/5d74966e000000000201cf74
10, view the log start case
命令：show variables like 'log_%';
example:
Zhengzhou infertility hospital: http: //jbk.39.net/yiyuanzaixian/zztjyy/
Second, create a database
1. Create a database
Command: create database database name;
example:
Third, delete the database
1, delete a database
Command: drop database database name;
example:
Fourth, modify the database
1, a database of a modified encoding
Command: alter database name of the database character set gbk
example:
Fifth, select the database
1, select a database
Commands: use database name;
example:
