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CREATE TABLE `organisations` ( organisation_id INT AUTO_INCREMENT, name VARCHAR(64), vip BOOLEAN, PRIMARY KEY (organisation_id) ); INSERT INTO `organisations` (name, vip) VALUES ("VIP-org", True), ("VIP inc.", True), ("Evil Corp", False), ("Rome", False); CREATE TABLE persons ( person_id INT AUTO_INCREMENT, name VARCHAR(64), organisation_id INT, PRIMARY KEY (person_id), FOREIGN KEY (organisation_id) REFERENCES `organisations`(organisation_id) ); INSERT INTO `persons` (name, organisation_id) VALUES ("Guy Fieri", 1), ("Fiona", 2), ("Mr. Robot", 3), ("Marcus Antonius", 4), ("Cicero", 4), ("Shrek", 2); CREATE TABLE presentations ( presentation_id INT AUTO_INCREMENT, person_id INT, PRIMARY KEY (presentation_id) ); INSERT INTO `presentations` (person_id) VALUES (1),(1),(1),(1), -- guy fieri has 4 (2), (3),(3),(3),(3),(3), (4),(4),(4),(4), (5),(5),(5), (6),(6),(6),(6);
SELECT `organisations`.name as organisation, COUNT(*) AS count FROM `presentations` JOIN `persons` ON `presentations`.person_id = `persons`.person_id JOIN `organisations` ON `organisations`.organisation_id = `persons`.organisation_id GROUP BY `organisations`.organisation_id ORDER BY `organisations`.vip DESC, count DESC;
organisation
count
VIP inc.
5
VIP-org
4
Rome
7
Evil Corp
5