MySQL---创建数据库与表

一.建立数据库

mysql> create database db_classes
    -> default charset = utf8mb4;
Query OK, 1 row affected (0.03 sec)
 
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| db_classes         |
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)

二.建立表

mysql> use db_classes;
Database changed
mysql> show tables;
Empty set (0.01 sec)
 
mysql> create table db_hero(
    -> id int not null,
    -> name varchar(100) not null,
    -> world varchar(100),
    -> );
Query OK, 0 rows affected (0.03 sec)
 
mysql> desc db_hero;
+----------+--------------+------+-----+---------+-------+
| Field    | Type         | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+-------+
| id       | int          | NO   |     | NULL    |       |
| name     | varchar(100) | NO   |     | NULL    |       |
| world    | varchar(100) | YES  |     | NULL    |       |
+----------+--------------+------+-----+---------+-------+
9 rows in set (0.00 sec)

三.插入数据

mysql> insert into db_hero values(1,"孙悟空","西游记");
Query OK, 1 row affected (0.01 sec)
 
mysql> insert into db_hero values(2,"林黛玉","红楼梦");
Query OK, 1 row affected (0.01 sec)
 
mysql> insert into db_hero values(3,"李逵","水浒传");
Query OK, 1 row affected (0.00 sec)
 
mysql> insert into db_hero values(4,"赵云","三国演义");
Query OK, 1 row affected (0.00 sec)
 
mysql> insert into db_hero values(5,"白龙马","西游记");
Query OK, 1 row affected (0.00 sec)
 
mysql> insert into db_hero values(6,"紫霞仙子","西游计");
Query OK, 1 row affected (0.00 sec)

结果

mysql> show tables;
+----------------------+
| Tables_in_db_classes |
+----------------------+
| db_hero              |
+----------------------+
1 row in set (0.00 sec)
 
mysql> select * from db_hero;
+----+--------------+-----------------+------+--------+--------------+-----------------+--------------+--------+
| id | name         | world        |
+----+--------------+-----------------+------+--------+--------------+-----------------+--------------+--------+
|  1 | 孙悟空       | 西游记       |     
|  2 | 林黛玉       | 红楼梦       |
|  3 | 李逵         | 水浒传       |
|  4 | 赵云         | 三国演义     |
|  5 | 白龙马       | 西游记       | 
|  6 | 紫霞仙子     | 西游计       |   
+----+--------------+-----------------+------+--------+--------------+-----------------+--------------+--------+
6 rows in set (0.00 sec)