@Target(value={}) @Retention(value=RUNTIME) public @interface UniqueConstraint
    Example:
    @Entity
    @Table(
        name="EMPLOYEE", 
        uniqueConstraints=
            @UniqueConstraint(columnNames={"EMP_ID", "EMP_NAME"})
    )
    public class Employee { ... }
 | Modifier and Type | Required Element and Description | 
|---|---|
| String[] | columnNames(Required) An array of the column names that make up the constraint. | 
Copyright © 2017. All Rights Reserved.