mysql

Using the BSG database described in this description, find the number of Certifications held by People grouped by a Planet.

This should have two columns:

"name" will be the names of planets that have at least one certification.

"CertCount" which will be the number of certifications held by people from that planet

Order your results by planet name in ascending order.

Example: If Lee is certified in "Viper" and "Mechanic" and Kara is certified in "Viper" and they are both from Caprica, then the "CertCount" for the planet Caprica should be 3.

Schema

-- Table structure for table `bsg_cert` -- DROP TABLE IF EXISTS `bsg_cert`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `bsg_cert` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(255) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=latin1; /*!40101 SET character_set_client = @saved_cs_client */; -- -- Dumping data for table `bsg_cert` -- LOCK TABLES `bsg_cert` WRITE; /*!40000 ALTER TABLE `bsg_cert` DISABLE KEYS */; INSERT INTO `bsg_cert` VALUES (1,'Raptor'),(2,'Viper'),(3,'Mechanic'),(4,'Command'); /*!40000 ALTER TABLE `bsg_cert` ENABLE KEYS */; UNLOCK TABLES; -- -- Table structure for table `bsg_cert_people` -- DROP TABLE IF EXISTS `bsg_cert_people`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `bsg_cert_people` ( `cid` int(11) NOT NULL DEFAULT '0', `pid` int(11) NOT NULL DEFAULT '0', PRIMARY KEY (`cid`,`pid`), KEY `pid` (`pid`), CONSTRAINT `bsg_cert_people_ibfk_1` FOREIGN KEY (`cid`) REFERENCES `bsg_cert` (`id`), CONSTRAINT `bsg_cert_people_ibfk_2` FOREIGN KEY (`pid`) REFERENCES `bsg_people` (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; /*!40101 SET character_set_client = @saved_cs_client */; -- -- Dumping data for table `bsg_cert_people` -- LOCK TABLES `bsg_cert_people` WRITE; /*!40000 ALTER TABLE `bsg_cert_people` DISABLE KEYS */; INSERT INTO `bsg_cert_people` VALUES (2,2),(4,2),(4,3),(2,4),(4,6),(1,7),(3,8),(3,9),(1,12),(1,14); /*!40000 ALTER TABLE `bsg_cert_people` ENABLE KEYS */; UNLOCK TABLES; -- -- Table structure for table `bsg_people` -- DROP TABLE IF EXISTS `bsg_people`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `bsg_people` ( `id` int(11) NOT NULL AUTO_INCREMENT, `fname` varchar(255) NOT NULL, `lname` varchar(255) DEFAULT NULL, `homeworld` int(11) DEFAULT NULL, `age` int(11) DEFAULT NULL, PRIMARY KEY (`id`), KEY `homeworld` (`homeworld`), CONSTRAINT `bsg_people_ibfk_1` FOREIGN KEY (`homeworld`) REFERENCES `bsg_planets` (`id`) ON DELETE SET NULL ON UPDATE CASCADE ) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=latin1; /*!40101 SET character_set_client = @saved_cs_client */; -- -- Dumping data for table `bsg_people` -- LOCK TABLES `bsg_people` WRITE; /*!40000 ALTER TABLE `bsg_people` DISABLE KEYS */; INSERT INTO `bsg_people` VALUES (1,'William','Adama',3,61),(2,'Lee','Adama',3,30),(3,'Laura','Roslin',3,NULL),(4,'Kara','Thrace',3,NULL),(5,'Gaius','Baltar',3,NULL),(6,'Saul','Tigh',NULL,71),(7,'Karl','Agathon',1,NULL),(8,'Galen','Tyrol',1,32),(9,'Callandra','Henderson',NULL,NULL),(10,'TestPerson',NULL,1,NULL),(11,'Samuel','Anders',19,NULL),(12,'Margaret','Edmondson',NULL,NULL),(13,'Brendan','Costanza',NULL,36),(14,'Sharon','Valerii',23,NULL); /*!40000 ALTER TABLE `bsg_people` ENABLE KEYS */; UNLOCK TABLES; -- -- Table structure for table `bsg_planets` -- DROP TABLE IF EXISTS `bsg_planets`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `bsg_planets` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) NOT NULL, `population` bigint(20) DEFAULT NULL, `language` varchar(255) DEFAULT NULL, `capital` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `name` (`name`) ) ENGINE=InnoDB AUTO_INCREMENT=24 DEFAULT CHARSET=latin1; /*!40101 SET character_set_client = @saved_cs_client */; -- -- Dumping data for table `bsg_planets` -- LOCK TABLES `bsg_planets` WRITE; /*!40000 ALTER TABLE `bsg_planets` DISABLE KEYS */; INSERT INTO `bsg_planets` VALUES (1,'Gemenon',2800000000,'Old Gemenese','Oranu'),(2,'Leonis',2600000000,'Leonese','Luminere'),(3,'Caprica',4900000000,'Caprican','Caprica City'),(7,'Sagittaron',1700000000,NULL,'Tawa'),(16,'Aquaria',25000,NULL,NULL),(17,'Canceron',6700000000,NULL,'Hades'),(18,'Libran',2100000,NULL,NULL),(19,'Picon',1400000000,NULL,'Queestown'),(20,'Scorpia',450000000,NULL,'Celeste'),(21,'Tauron',2500000000,'Tauron','Hypatia'),(22,'Virgon',4300000000,NULL,'Boskirk'),(23,'Troy',NULL,NULL,NULL); /*!40000 ALTER TABLE `bsg_planets` ENABLE KEYS */; UNLOCK TABLES; -- -- Table structure for table `bsg_ship_assignment` -- DROP TABLE IF EXISTS `bsg_ship_assignment`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `bsg_ship_assignment` ( `pid` int(11) NOT NULL, `cid` int(11) NOT NULL, `sid` int(11) NOT NULL, PRIMARY KEY (`pid`,`cid`,`sid`), KEY `sid` (`sid`), KEY `cid` (`cid`,`sid`), CONSTRAINT `bsg_ship_assignment_ibfk_2` FOREIGN KEY (`cid`, `sid`) REFERENCES `bsg_ship_instance` (`class`, `id`), CONSTRAINT `bsg_ship_assignment_ibfk_1` FOREIGN KEY (`pid`) REFERENCES `bsg_people` (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; /*!40101 SET character_set_client = @saved_cs_client */; -- -- Dumping data for table `bsg_ship_assignment` -- LOCK TABLES `bsg_ship_assignment` WRITE; /*!40000 ALTER TABLE `bsg_ship_assignment` DISABLE KEYS */; INSERT INTO `bsg_ship_assignment` VALUES (1,1,1),(2,2,1),(8,1,1),(9,1,1),(13,3,3),(13,3,87),(2,4,121),(12,3,179),(2,4,289),(5,4,289),(4,5,316),(12,3,621),(13,3,621),(2,4,1104),(3,5,2343),(13,5,2343),(11,5,3203),(13,4,7242),(1,5,8757),(11,5,8757); /*!40000 ALTER TABLE `bsg_ship_assignment` ENABLE KEYS */; UNLOCK TABLES; -- -- Table structure for table `bsg_ship_class` -- DROP TABLE IF EXISTS `bsg_ship_class`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `bsg_ship_class` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(1000) NOT NULL, `variant` varchar(1000) DEFAULT NULL, `LOA` int(11) DEFAULT NULL, `crew_capacity` int(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=latin1; /*!40101 SET character_set_client = @saved_cs_client */; -- -- Dumping data for table `bsg_ship_class` -- LOCK TABLES `bsg_ship_class` WRITE; /*!40000 ALTER TABLE `bsg_ship_class` DISABLE KEYS */; INSERT INTO `bsg_ship_class` VALUES (1,'Battlestar','Galactica',4720,5000),(2,'Battlestar','Pegasus',5872,1750),(3,'Raptor',NULL,28,10),(4,'Viper','Mk II',28,1),(5,'Viper','Mk VII',32,1),(6,'Colonial One',NULL,277,150),(7,'Astral Queen',NULL,NULL,1500),(8,'Gemenon Traveler',NULL,197,NULL); /*!40000 ALTER TABLE `bsg_ship_class` ENABLE KEYS */; UNLOCK TABLES; -- -- Table structure for table `bsg_ship_instance` -- DROP TABLE IF EXISTS `bsg_ship_instance`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `bsg_ship_instance` ( `id` int(11) NOT NULL, `class` int(11) NOT NULL, `operational` tinyint(1) DEFAULT NULL, `based_in_id` int(11) DEFAULT NULL, `based_in_class` int(11) DEFAULT NULL, PRIMARY KEY (`id`,`class`), KEY `class` (`class`), KEY `based_in_id` (`based_in_id`,`based_in_class`), CONSTRAINT `bsg_ship_instance_ibfk_2` FOREIGN KEY (`based_in_id`, `based_in_class`) REFERENCES `bsg_ship_instance` (`id`, `class`), CONSTRAINT `bsg_ship_instance_ibfk_1` FOREIGN KEY (`class`) REFERENCES `bsg_ship_class` (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; /*!40101 SET character_set_client = @saved_cs_client */; --