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create index [index_mode] on [cn_name]([car_mode]);
index_mode自定义索引名
cn_name表名
car_mode列名
1.创建普通索引
SQL CREATE INDEX 语法
在表上创建一个简单的索引。允许使用重复的值：
CREATE INDEX index_name ON table_name (column_name);
注释：“column_name” 规定需要索引的列。
2.创建唯一索引
SQL CREATE UNIQUE INDEX 语法
在表上创建一个唯一的索引。唯一的索引意味着两个行不能拥有相同的索引值。
CREATE UNIQUE INDEX index_name ON table_name (column_name);
3.实例
CREATE INDEX 实例
本例会创建一个简单的索引，名为 “PersonIndex”，在 Person 表的 LastName 列：
CREATE INDEX PersonIndex ON Person (LastName);
4.索引添加约束
如果您希望以降序索引某个列中的值，您可以在列名称之后添加保留字 DESC：
CREATE INDEX PersonIndex ON Person (LastName DESC);
5.组合索引
假如您希望索引不止一个列，您可以在括号中列出这些列的名称，用逗号隔开：
CREATE INDEX PersonIndex ON Person (LastName, FirstName);
