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## javax.persistence
Annotation Type UniqueConstraint

    @Target(value=TYPE)
    @Retention(value=RUNTIME)
    public @interface UniqueConstraint

This annotation is used to specify that a unique constraint is to be included in the generated DDL for a primary or secondary table.

        Example:
        @Entity
        @Table(
            name="EMPLOYEE",
            uniqueConstraints=
                @UniqueConstraint(columnNames={"EMP_ID", "EMP_NAME"})
        )
        public class Employee { ... }

Since:
  Java Persistence 1.0

Required Element Summary
`String[]` | `columnNames` (Required) An array of the column names that make up the constraint.

Element Detail

### columnNames

    public abstract String[] columnNames

  (Required) An array of the column names that make up the constraint.

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