tmp

db/db.ddl

@@ -355,3 +355,23 @@ CREATE TABLE reg_requests (
 	user_id		int		DEFAULT NULL REFERENCES users(user_id) ON DELETE CASCADE,
 	client		varchar(255)	NOT NULL			-- kdo si registraci vyžádal
 );
+
+-- Statistiky
+
+-- Pro každý region úrovně <= 2 spočítáme všechna podřízená místa
+CREATE VIEW region_descendants AS
+	WITH RECURSIVE descendant_regions(place_id, descendant) AS (
+		SELECT place_id, place_id FROM places WHERE level BETWEEN 1 AND 2
+		UNION SELECT r.place_id, p.place_id
+		      FROM descendant_regions r, places p
+		      WHERE p.parent = r.descendant
+	) SELECT place_id AS region, descendant FROM descendant_regions;
+
+-- Pro každou trojici (kolo, region, stav účasti) spočítáme účastníky.
+-- Pokud se to ukáže být příliš pomalé, přejdeme na materializovaná views.
+CREATE VIEW region_stats AS
+	SELECT c.round_id, rd.region, p.state, count(*)
+	FROM participations p
+	JOIN contests c USING(contest_id)
+	JOIN region_descendants rd ON rd.descendant = c.place_id
+	GROUP BY c.round_id, rd.region, p.state;

db/upgrade-20210924.sql

+SET ROLE 'mo_osmo';
+
+CREATE VIEW region_descendants AS
+	WITH RECURSIVE descendant_regions(place_id, descendant) AS (
+		SELECT place_id, place_id FROM places WHERE level BETWEEN 1 AND 2
+		UNION SELECT r.place_id, p.place_id
+		      FROM descendant_regions r, places p
+		      WHERE p.parent = r.descendant
+	) SELECT place_id AS region, descendant FROM descendant_regions;
+
+CREATE VIEW region_stats AS
+	SELECT c.round_id, rd.region, p.state, count(*)
+	FROM participations p
+	JOIN contests c USING(contest_id)
+	JOIN region_descendants rd ON rd.descendant = c.place_id
+	GROUP BY c.round_id, rd.region, p.state;