1、建立一个utf8编码的数据库test1
create database test1;
2、建立商品表goods和栏目表category
按如下表结构创建表：存储引擎engine myisam 字符集charset utf8
mysql> desc goods;
+------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------+-------------+------+-----+---------+----------------+
| goods_id | int(11) | NO | PRI | NULL | auto_increment |
| goods_name | varchar(20) | NO | | | |
| cat_id | int(11) | NO | | 0 | |
| brand_id | int(11) | NO | | 0 | |
| goods_sn | char(12) | NO | | | |
| shop_price | float(6,2) | NO | | 0.00 | |
| goods_desc | text | YES | | NULL | |
+------------+-------------+------+-----+---------+----------------+
7 rows in set (0.00 sec)
mysql> desc category;
+-----------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+----------------+
| cat_id | int(11) | NO | PRI | NULL | auto_increment |
| cate_name | varchar(20) | NO | | | |
| parent_id | int(11) | NO | | 0 | |
+-----------+-------------+------+-----+---------+----------------+
3 rows in set (0.00 sec)
3、删除 goods 表中的 goods_desc 字段及货号字段,并增加 click_count 字段
4、在 goods_name 列上加唯一性索引（用alter table方式）
5、在 shop_price 列上加普通索引（用create index方式）
6、在 click_count 上增加普通索引，然后再删除 （分别使用drop index和alter table删除）
