mysql举例分析

下文内容主要给大家带来mysql举例分析，这里所讲到的知识，与书籍略有不同，都是亿速云专业技术人员在与用户接触过程中，总结出来的，具有一定的经验分享价值，希望给广大读者带来帮助。 

mysql安装不介绍，mysql -uroot -p
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
4 rows in set (0.02 sec)
创建表
mysql> create database publications;
Query OK, 1 row affected (0.00 sec)
查看表并使用
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| publications       |
| test               |
+--------------------+
5 rows in set (0.00 sec)

mysql> use publications;
Database changed
创建数据库管理用户
mysql> *grant all on publications. to 'huang'@'localhost' identified by "123456";
Query OK, 0 rows affected (0.00 sec)
更新权限
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
创建表 查看表

mysql> create table classics(author varchar(128), title varchar(128), type varchar(16), year char(4));**
Query OK, 0 rows affected (0.01 sec)

mysql> desc classics;
+--------+--------------+------+-----+---------+-------+
| Field  | Type         | Null | Key | Default | Extra |
+--------+--------------+------+-----+---------+-------+
| author | varchar(128) | YES  |     | NULL    |       |
| title  | varchar(128) | YES  |     | NULL    |       |
| type   | varchar(16)  | YES  |     | NULL    |       |
| year   | char(4)      | YES  |     | NULL    |       |
+--------+--------------+------+-----+---------+-------+
4 rows in set (0.00 sec)
删除表
mysql> drop table classics;
Query OK, 0 rows affected (0.00 sec)

再次创建表，增加id选项
mysql> create table classics(author varchar(128), title varchar(128), type varchar(16), year char(4),id INT unsigned not null auto_increment key)ENGINE MyISAM;
Query OK, 0 rows affected (0.01 sec)
删除id选项
mysql> alter table classics drop id;
Query OK, 0 rows affected (0.00 sec)
Records: 0  Duplicates: 0  Warnings: 0

表中插入数据
mysql> insert into classics(author,title,type,year)
-> values("mark twain","muguangzhicheng",'fiction',"1876");
Query OK, 1 row affected (0.00 sec)

mysql> insert into classics(author,title,type,year) values("frank hello","xianglongshibazhang",'fiction',"1856");
Query OK, 1 row affected (0.00 sec)

mysql> insert into classics(author,title,type,year) values("world go","shgendiaoxialv",'play',"1841");
Query OK, 1 row affected (0.00 sec)

mysql> insert into classics(author,title,type,year) values("nale","xiakexing",'play',"1541");
Query OK, 1 row affected (0.00 sec)

mysql> select * from classics;
+-------------+---------------------+---------+------+
| author      | title               | type    | year |
+-------------+---------------------+---------+------+
| mark twain  | muguangzhicheng     | fiction | 1876 |
| frank hello | xianglongshibazhang | fiction | 1856 |
| world go    | shgendiaoxialv      | play    | 1841 |
| nale        | xiakexing           | play    | 1541 |
+-------------+---------------------+---------+------+
4 rows in set (0.00 sec)

更改表名称
mysql> alter table classics rename pre1900;
Query OK, 0 rows affected (0.00 sec)

mysql> show tables;
+------------------------+
| Tables_in_publications |
+------------------------+
| pre1900                |
+------------------------+
1 row in set (0.00 sec)

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