anchor.diff:    `sample_id` varchar(255) NOT NULL,
     `type` varchar(128) NOT NULL,
     PRIMARY KEY (`sample_id`,`type`),
  +  CONSTRAINT `FK_SAMPLE_MATERIAL_sample_id` FOREIGN KEY (`sample_id`) REFERENCES `SAMPLES` (`id`),
     CONSTRAINT `SAMPLE_MATERIAL_ibfk_1` FOREIGN KEY (`sample_id`) REFERENCES `SAMPLES` (`id`)
   ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
   /*!40101 SET character_set_client = @saved_cs_client */;
  
positive.code: /*!40101 SET character_set_client = utf8 */;
  CREATE TABLE `SAMPLECOLLECTIONS` (
    `id` varchar(255) NOT NULL,
    `acronym` varchar(1024) NOT NULL,
    `name` varchar(1024) NOT NULL,
    `description` varchar(2000) DEFAULT NULL,
    `contact` varchar(255) NOT NULL,
    `study` varchar(128) DEFAULT NULL,
    PRIMARY KEY (`id`),
    KEY `contact` (`contact`),
    KEY `study` (`study`),
    CONSTRAINT `SAMPLECOLLECTIONS_ibfk_1` FOREIGN KEY (`contact`) REFERENCES `USERS` (`EMAIL`),
    CONSTRAINT `SAMPLECOLLECTIONS_ibfk_2` FOREIGN KEY (`study`) REFERENCES `study` (`name`)
  ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
  
negative.code:   `collection_id` varchar(255) NOT NULL,
    `type` varchar(128) NOT NULL,
    PRIMARY KEY (`collection_id`,`type`),
    CONSTRAINT `FK_SAMPLECOLLECTION_TYPE_collection_id` FOREIGN KEY (`collection_id`) REFERENCES `SAMPLECOLLECTIONS` (`id`),
    CONSTRAINT `SAMPLECOLLECTION_TYPE_ibfk_1` FOREIGN KEY (`collection_id`) REFERENCES `SAMPLECOLLECTIONS` (`id`)
  ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
  /*!40101 SET character_set_client = @saved_cs_client */;
  