MySQL之终端（Terminal）管理数据库数据表数据的基本操作
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sudo /Applications/XAMPP/xamppfiles/bin/mysql.server start
/Applications/XAMPP/xamppfiles/bin/mysql -h localhost -u root -p;
http://www.cnblogs.com/GarveyCalvin/p/4297282.html#createDatabase
1、
mysql> select version();
+-----------+
| version() |
+-----------+
| 5.6.16 |
+-----------+
1 row in set (0.07 sec)
1、数据库（database）管理
3、 drop database firstDB;
2、数据表（table）管理
2.1 create表
mysql> create table people
-> (
-> ID int auto_increment primary key,
-> Name varchar(20) not null,
-> AGE int not null,
-> Birthday datetime);
2.4 alter 修改表结构（增、删、改）
1、修改数据库编码
alter table people convert to character set UTF8;
2.4.1 insert 在表中添加列（字段）
alter table people add star bool;
mysql> desc people;
+----------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+----------------+
| ID | int(11) | NO | PRI | NULL | auto_increment |
| Name | varchar(20) | NO | | NULL | |
| AGE | int(11) | NO | | NULL | |
| Birthday | datetime | YES | | NULL | |
| star | tinyint(1) | YES | | NULL | |
+----------+-------------+------+-----+---------+----------------+
5 rows in set (0.00 sec)
2.4.2 alter 修改表（列）字段
alter table people modify star int;
2.4.3 delete 删除表（列）字段
alter table people drop column star;
2.4.4 rename 重命名表名
rename table newpeople to people;
mysql> show tables;
+------------------------+
| Tables_in_testdatabase |
+------------------------+
| newpeople |
+------------------------+
2.4.5 null or not null
mysql> alter table people modify AGE int(3) NOT NULL;
Query OK, 0 rows affected (0.12 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> desc people ;
+----------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+----------------+
| ID | int(11) | NO | PRI | NULL | auto_increment |
| Name | varchar(20) | NO | | NULL | |
| AGE | int(3) | NO | | NULL | |
| Birthday | datetime | YES | | NULL | |
+----------+-------------+------+-----+---------+----------------+
4 rows in set (0.01 sec)
2.5 create 利用已有数据创建新表
mysql> create table newpeople select * from people;
Query OK, 0 rows affected (0.21 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> desc newpeople;
+----------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| ID | int(11) | NO | | 0 | |
| Name | varchar(20) | NO | | NULL | |
| AGE | int(3) | NO | | NULL | |
| Birthday | datetime | YES | | NULL | |
+----------+-------------+------+-----+---------+-------+
4 rows in set (0.00 sec)
3、数据的操作及管理
3.1 增加数据（增）
mysql> insert into people values (null,‘lpw‘,20,‘1990-10-10‘);
Query OK, 1 row affected (0.10 sec)
mysql> select * from people;
+----+------+-----+---------------------+
| ID | Name | AGE | Birthday |
+----+------+-----+---------------------+
| 1 | lpw | 20 | 1990-10-10 00:00:00 |
+----+------+-----+---------------------+
1 row in set (0.02 sec)
mysql> select * from people;
+----+--------+-----+---------------------+
| ID | Name | AGE | Birthday |
+----+--------+-----+---------------------+
| 1 | lpw | 20 | 1990-10-10 00:00:00 |
| 2 | 张三 | 21 | 1990-10-10 00:00:00 |
| 3 | 李四 | 15 | 1995-01-19 00:00:00 |
| 4 | 王五 | 15 | 1965-04-09 00:00:00 |
+----+--------+-----+---------------------+
3.2 删除数据（删）
delete from PEOPLE where name = ‘Lisa‘;
3.3 修改数据（改）
mysql> update PEOPLE set name=‘Calvin‘ where name = ‘Garvey‘;
3.4 查询数据（查）
select * from people;
4、管理视图
视图是从数据库里导出一个或多个表的虚拟表，是用来方便用户对数据的操作。
mysql> create view people_view ( Name,AGE) as select Name,AGE from people;
mysql> show tables;
+------------------------+
| Tables_in_testdatabase |
+------------------------+
| newpeople |
| people |
| people_view |
+------------------------+
3 rows in set (0.00 sec)
mysql> select * from people_view;
+--------+-----+
| Name | AGE |
+--------+-----+
| lpw | 20 |
| 张三 | 21 |
| 李四 | 15 |
| 王五 | 15 |
+--------+-----+
4 rows in set (0.03 sec)
mysql>
mysql> desc people_view;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| Name | varchar(20) | NO | | NULL | |
| AGE | int(3) | NO | | NULL | |
+-------+-------------+------+-----+---------+-------+
2 rows in set (0.03 sec)
mysql>
替换视图
mysql> create or replace view people_view(people_ID,people_Name,people_AGE) as select ID,Name,AGE from people;
Query OK, 0 rows affected (0.13 sec)
mysql> select * from people_view;
+-----------+-------------+------------+
| people_ID | people_Name | people_AGE |
+-----------+-------------+------------+
| 1 | lpw | 20 |
| 2 | 张三 | 21 |
| 3 | 李四 | 15 |
| 4 | 王五 | 15 |
+-----------+-------------+------------+
4 rows in set (0.00 sec)
操作视图
当视图数据有变化时（增、删、改），真实的表数据也会随着改变。也就是说，对视图的操作就是对表的数据，所以我们可以把视图当作表。
mysql> insert into people_view values(null,‘tao‘,25);
mysql> select * from people_view;
+-----------+-------------+------------+
| people_ID | people_Name | people_AGE |
+-----------+-------------+------------+
| 1 | lpw | 20 |
| 2 | 张三 | 21 |
| 3 | 李四 | 15 |
| 4 | 王五 | 15 |
| 5 | tao | 25 |
+-----------+-------------+------------+
5 rows in set (0.00 sec)
mysql> select * from people;
+----+--------+-----+---------------------+
| ID | Name | AGE | Birthday |
+----+--------+-----+---------------------+
| 1 | lpw | 20 | 1990-10-10 00:00:00 |
| 2 | 张三 | 21 | 1990-10-10 00:00:00 |
| 3 | 李四 | 15 | 1995-01-19 00:00:00 |
| 4 | 王五 | 15 | 1965-04-09 00:00:00 |
| 5 | tao | 25 | NULL |
+----+--------+-----+---------------------+
5 rows in set (0.00 sec)
删除视图
mysql> drop view people_view;
mysql> select database();
+------------+
| database() |
+------------+
| firstdb |
+------------+
1 row in set (0.00 sec)
mysql> mysql> select * from newduanzitabl (news_id in (1,4,5));
+---------+----------------------------------------------------------+---------------------+--------------+-----------+-----------------+------+
| news_id | news_content | news_timestr | news_graburl | news_type | news_sourcename | love |
+---------+----------------------------------------------------------+---------------------+--------------+-----------+-----------------+------+
| 1 | 迟早要沉的泰坦尼克号 | 2014-09-27 18:42:01 | | 9 | 百思不得姐 | 0 |
| 4 | 景德镇淘的 感觉自己要发财了 | 2014-09-27 18:06:01 | | 9 | 百思不得姐 | 0 |
| 5 | 见过草船借箭的 开灰机借箭的 哪个见过？ | 2014-09-27 17:54:01 | | 9 | 百思不得姐 | 0 |
+---------+----------------------------------------------------------+---------------------+--------------+-----------+-----------------+------+
3 rows in set (0.00 sec)
mysql> SELECT * FROM newduanzitable where news_content like ‘绝对%‘;
+---------+-----------------+---------------------+--------------+-----------+-----------------+------+
| news_id | news_content | news_timestr | news_graburl | news_type | news_sourcename | love |
+---------+-----------------+---------------------+--------------+-----------+-----------------+------+
| 15 | 绝对亲生的 | 2014-09-27 15:30:02 | | 9 | 百思不得姐 | 0 |
+---------+-----------------+---------------------+--------------+-----------+-----------------+------+
1 row in set (0.00 sec)
mysql> desc sw_goods;
+-------------------+---------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------------+---------------+------+-----+---------+----------------+
| goods_id | int(11) | NO | PRI | NULL | auto_increment |
| goods_name | varchar(128) | NO | | | |
| goods_weight | int(11) | NO | | 0 | |
| goods_price | decimal(10,2) | NO | | 0.00 | |
| goods_number | int(11) | NO | | 100 | |
| goods_category_id | int(11) | NO | | 0 | |
| goods_brand_id | int(11) | NO | | 0 | |
| goods_introduce | text | YES | | NULL | |
| goods_big_img | varchar(128) | NO | | | |
| goods_small_img | varchar(128) | NO | | | |
| goods_create_time | int(11) | NO | | 0 | |
| goods_last_time | int(11) | NO | | 0 | |
| abc | varchar(32) | NO | | NULL | |
+-------------------+---------------+------+-----+---------+----------------+
mysql> select goods_category_id,avg(goods_price) from sw_goods group by goods_category_id;
+-------------------+------------------+
| goods_category_id | avg(goods_price) |
+-------------------+------------------+
| 0 | 2027.055556 |
| 2 | 823.330000 |
| 3 | 1857.066667 |
| 4 | 2904.333333 |
| 5 | 4000.000000 |
| 8 | 111.000000 |
| 13 | 33.500000 |
| 14 | 54.000000 |
| 15 | 45.000000 |
| 23 | 3456.000000 |
+-------------------+------------------+
10 rows in set (0.07 sec)
mysql> select max(goods_price) as tp_max from sw_goods;
+----------+
| tp_max |
+----------+
| 12000.00 |
+----------+
1 row in set (0.00 sec)
mysql>
mysql> select count(*) as tp_count from sw_goods where goods_price >10000;
+----------+
| tp_count |
+----------+
| 1 |
+----------+
1 row in set (0.00 sec)
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