Used in conjunction with the EntityResult annotation to map columns specified in the SELECT list of a SQL query to the properties or fields of an entity class.

Example:
  Query q = em.createNativeQuery(
      "SELECT o.id AS order_id, " +
          "o.quantity AS order_quantity, " +
          "o.item AS order_item, " +
        "FROM Order o, Item i " +
        "WHERE (order_quantity > 25) AND (order_item = i.id)",
      "OrderResults");

  @SqlResultSetMapping(name="OrderResults",
      entities={
          @EntityResult(entityClass=com.acme.Order.class, fields={
              @FieldResult(name="id", column="order_id"),
              @FieldResult(name="quantity", column="order_quantity"),
              @FieldResult(name="item", column="order_item")})
      })