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	sqlite3	mysql
创建数据库	sqlite3 数据库文件名	create database 数据库名;
查看数据库列表	.databases	show databases;
打开数据库	.open WebDB.db	use WebDB;
查看数据库中的表	.tables	show tables;
查看表的字段信息	.schema 表名	desc 表名;
退出	.quit	exit

创建数据库

• sqlite3
  数据库名后面一般都会加上.db后缀。创建完，做一下其他操作如下面的例子是查看数据库列表，否则不会创建数据库文件。

~/Desktop$ sqlite3 WebDB.db
SQLite version 3.28.0 2019-04-16 19:49:53
Enter ".help" for usage hints.
sqlite> .databases 
main: /home/kyun/Desktop/WebDB.db
sqlite> 

• mysql

~/Desktop$ mysql -u kyunwong -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 14
Server version: 10.1.43-MariaDB-0ubuntu0.18.04.1 Ubuntu 18.04Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.MariaDB [(none)]> create database WebDB;
Query OK, 1 row affected (0.00 sec)

查看数据库列表

• sqlite3

sqlite> .databases 
main: /home/kyun/Desktop/WebDB.db

• mysql

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| WebDB              |
| information_schema |
| mysql              |
| performance_schema |
| wong_web_db        |
+--------------------+
5 rows in set (0.01 sec)

打开数据库

• sqlite3

sqlite>  .open WebDB.db

• mysql

MariaDB [(none)]> use WebDB;
Database changed
MariaDB [WebDB]> 

查看数据库中的表

• sqlite3

sqlite> .tables
products

• mysql

MariaDB [WebDB]> show tables;
+-----------------+
| Tables_in_WebDB |
+-----------------+
| product         |
+-----------------+
1 row in set (0.01 sec)

查看表字段信息

• sqlite3

sqlite> .schema products
CREATE TABLE products(id int not null primary key,name varchar(32),price int default 0);

• mysql

MariaDB [WebDB]> desc product;
+-------+-------------+------+-----+---------+----------------+
| Field | Type        | Null | Key | Default | Extra          |
+-------+-------------+------+-----+---------+----------------+
| id    | int(10)     | NO   | PRI | NULL    | auto_increment |
| name  | varchar(32) | YES  |     | NULL    |                |
| price | int(11)     | YES  |     | 0       |                |
+-------+-------------+------+-----+---------+----------------+
3 rows in set (0.03 sec)

或者

MariaDB [WebDB]> show create table product;
+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table   | Create Table                                                                                                                                                                                    |
+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| product | CREATE TABLE `product` (`id` int(10) NOT NULL AUTO_INCREMENT,`name` varchar(32) DEFAULT NULL,`price` int(11) DEFAULT '0',PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 |
+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

或者

MariaDB [WebDB]> show full fields from product;
+-------+-------------+--------------------+------+-----+---------+----------------+---------------------------------+---------+
| Field | Type        | Collation          | Null | Key | Default | Extra          | Privileges                      | Comment |
+-------+-------------+--------------------+------+-----+---------+----------------+---------------------------------+---------+
| id    | int(10)     | NULL               | NO   | PRI | NULL    | auto_increment | select,insert,update,references |         |
| name  | varchar(32) | utf8mb4_general_ci | YES  |     | NULL    |                | select,insert,update,references |         |
| price | int(11)     | NULL               | YES  |     | 0       |                | select,insert,update,references |         |
+-------+-------------+--------------------+------+-----+---------+----------------+---------------------------------+---------+
3 rows in set (0.00 sec)

或者

MariaDB [WebDB]> show fields  from product;
+-------+-------------+------+-----+---------+----------------+
| Field | Type        | Null | Key | Default | Extra          |
+-------+-------------+------+-----+---------+----------------+
| id    | int(10)     | NO   | PRI | NULL    | auto_increment |
| name  | varchar(32) | YES  |     | NULL    |                |
| price | int(11)     | YES  |     | 0       |                |
+-------+-------------+------+-----+---------+----------------+
3 rows in set (0.01 sec)

退出

• sqlite3

sqlite> .quit

• mysql

MariaDB [WebDB]> exit