UniqueConstraint (Jakarta Persistence API documentation)

```
@Target({})
@Retention(RUNTIME)
public @interface UniqueConstraint
```
Specifies that a unique constraint is to be included in the generated DDL for a primary or secondary table.
Example: {@snippet :

Since:

1.0

Required Element Summary

Required Elements
Modifier and Type Required Element Description

String[] columnNames
(Required) The names of the column which make up the constraint.

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`String`	`name`	(Optional) The name of the constraint.
`String`	`options`	(Optional) A SQL fragment appended to the generated DDL which creates this constraint.

- Element Detail
  - columnNames
```
String[] columnNames
```
    (Required) The names of the column which make up the constraint.
- - name
```
String name
```
    (Optional) The name of the constraint.
    Defaults to a provider-generated name.
    
    Since:
    
    2.0
    
    Default:
    
    ""
- - options
```
String options
```
    (Optional) A SQL fragment appended to the generated DDL which creates this constraint.
    
    Since:
    
    3.2
    
    Default:
    
    ""