Index (persistence-api 2.2.4 API)

```
@Target({})
@Retention(RUNTIME)
public @interface Index
```
The Index annotation is used in schema generation. Note that it is not necessary to specify an index for a primary key, as the primary key index will be created automatically, however, the Index annotation may be used to specify the ordering of the columns in the index for the primary key.

Since:

JPA 2.1

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  String columnList
  (Required) The names of the columns to be included in the index.
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  String name
  (Optional) The name of the index.
  
  boolean unique
  (Optional) Whether the index is unique.

- Element Detail
  - columnList
```
String columnList
```
    (Required) The names of the columns to be included in the index.
    
    Returns:
    
    The names of the columns making up the index
- - name
```
String name
```
    (Optional) The name of the index. Defaults to a provider-generated value.
    
    Returns:
    
    The index name
    
    Default:
    
    ""
- - unique
```
boolean unique
```
    (Optional) Whether the index is unique. Default is false.
    
    Returns:
    
    Is the index unique?
    
    Default:
    
    false