二. MySQL常用命令
2.1 查看数据库
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| bjpowernode |
| ecshop |
| mysql |
| performance_schema |
| sys |
| test01 |
| test02 |
| test03 |
+--------------------+
9 rows in set (0.00 sec)
2.2 创建数据库
mysql> create database bjpowernode; # 创建名为bjpowernode的数据库
Query OK, 1 row affected (0.00 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| bjpowernode |
| ecshop |
| mysql |
| performance_schema |
| sys |
| test01 |
| test02 |
| test03 |
| test04 |
+--------------------+
10 rows in set (0.00 sec)
2.3 选择使用某数据库
mysql> use test02;
Database changed
# 表示正在使用一个名字叫做test02的数据库。
2.4 查看该数据库下有哪些表
mysql> show tables; # test02中的表
+------------------+
| Tables_in_test02 |
+------------------+
| db01 |
| db02 |
| dept |
| emp |
| salgrade |
| user |
+------------------+
6 rows in set (0.00 sec)
2.5 查看当前使用的哪个数据库
mysql> select database();
+------------+
| database() |
+------------+
| test02 |
+------------+
1 row in set (0.00 sec)
2.6 查看表中的数据
这里我们查询 bjpowernode中的数据
select * from 表名; //统一执行这个SQL语句
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| bjpowernode |
| ecshop |
| mysql |
| performance_schema |
| sys |
| test01 |
| test02 |
| test03 |
| test04 |
+--------------------+
10 rows in set (0.00 sec)
mysql> use bjpowernode
Database changed
mysql> show tables;
+-----------------------+
| Tables_in_bjpowernode |
+-----------------------+
| dept |
| emp |
| salgrade |
+-----------------------+
3 rows in set (0.00 sec)
mysql> select * from dept; # select * from 表名; //统一执行这个SQL语句
+--------+------------+----------+
| DEPTNO | DNAME | LOC |
+--------+------------+----------+
| 10 | ACCOUNTING | NEW YORK |
| 20 | RESEARCH | DALLAS |
| 30 | SALES | CHICAGO |
| 40 | OPERATIONS | BOSTON |
+--------+------------+----------+
4 rows in set (0.00 sec)
2.7 不看表中的数据，只看表的结构
mysql> desc dept; # desc-->describe
+--------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+-------+
| DEPTNO | int(2) | NO | PRI | NULL | |
| DNAME | varchar(14) | YES | | NULL | |
| LOC | varchar(13) | YES | | NULL | |
+--------+-------------+------+-----+---------+-------+
3 rows in set (0.00 sec)
2.8 查看当前数据库版本号
mysql> select version();
+-----------+
| version() |
+-----------+
| 5.7.19 |
+-----------+
1 row in set (0.00 sec)
2.9 向数据库中导入表
mysql> source F:\bjpowernode.sql # 必须先create数据库，然后use数据库再进行该操作
# 会出现一大堆Query...
2.10 退出mysql
mysql> exit
mysql见不到
“;”就不会执行（“;”表示结束）\c用来终止一条命令的输入
整理命令：
mysql> show databases; # 查看数据库
mysql> use test02; # 选择某数据库
mysql> show tables; # 查看该数据库中的表（先要use...）
mysql> select database(); # 查看当前使用的那个数据库
mysql> select * from 表名; # 查看表中的数据
mysql> desc dept; # 不看表中的数据，只看表的结构
mysql> select version(); # 查看当前版本
mysql> create database test04; # 创建名为test04的数据库
mysql> source F:\bjpowernode.sql # 向数据库中导入表，必须先create数据库，然后use数据库再进行该操作
mysql> exit # 退出