原始表student字段：

mysql> select column_name,data_type
    -> from information_schema.columns
    -> where table_name = 'student';
+-------------+-----------+
| column_name | data_type |
+-------------+-----------+
| stu_id      | int       |
| stu_name    | varchar   |
| stu_tel     | int       |
| stu_score   | int       |
+-------------+-----------+
4 rows in set (0.01 sec)

mysql> select * from student;
+--------+----------+---------+-----------+
| stu_id | stu_name | stu_tel | stu_score |
+--------+----------+---------+-----------+
|      1 | a        |     151 |        60 |
|      2 | b        |     152 |        61 |
|      3 | c        |     153 |        62 |
|      4 | d        |     154 |        63 |
+--------+----------+---------+-----------+
4 rows in set (0.00 sec)

索引创建格式：

create [ <index type> ] index <index name> [ using {btree | hash} ] on table specification ( <column in index> [,<column in index> ] )
<index type> := unique | fulltext | spatial
<column in index>:=<column name> [asc | desc]

创建一个最简单的索引：

mysql> create index stu_index 
    -> on student(stu_id);
Query OK, 0 rows affected (0.36 sec)
Records: 0  Duplicates: 0  Warnings: 0

如果没有指定using声明的话，mysql自动创建一个B树。所以上面的索引其实是这样子的：

mysql> create index stu_index using btree 
    -> on student(stu_id asc);
Query OK, 0 rows affected (0.19 sec)
Records: 0  Duplicates: 0  Warnings: 0

也可以为多个列创建唯一的索引：

mysql> create unique index stu_index using hash 
    -> on student(stu_id,stu_name);
Query OK, 0 rows affected (0.19 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> alter table student
    -> add unique index stu_index2
    -> using hash (stu_tel);
Query OK, 0 rows affected (0.36 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> drop index stu_index on student;
Query OK, 0 rows affected (0.22 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> create table student(
    -> stu_id          int primary key,
    -> stu_name        varchar(5) not null,
    -> stu_tel         int(5) unique,
    -> stu_score       int(2),
    -> index stu_index(stu_id)
    -> );

只需在表的最后添加创建索引的语句即可。

视图