Update gym_tracker.sql

mysql/gym_tracker.sql

@@ -152,27 +152,18 @@ CREATE TABLE
         FOREIGN KEY (gym_id) REFERENCES gym(gym_id)
     );
 
--- -- Trigger for average_rating if not exists
-
--- DELIMITER $$
-
--- CREATE TRIGGER IF NOT EXISTS average_rating
-
--- AFTER INSERT ON ratings
-
--- FOR EACH ROW
-
--- BEGIN
-
---     UPDATE gym
-
---     SET average_rating = (SELECT AVG(rating) FROM ratings WHERE gym_id = NEW.gym_id)
-
---     WHERE gym_id = NEW.gym_id;
-
--- END$$
-
--- Trigger for average_rating if not exists
+CREATE TRIGGER avg_rating_insert_trg 
+AFTER INSERT
+ON ratings FOR EACH ROW 
+BEGIN 
+    UPDATE gym
+    SET average_rating = (
+        SELECT AVG(rating)
+        FROM ratings
+        WHERE gym_id = NEW.gym_id
+    )
+    WHERE gym_id = NEW.gym_id;
+END;
 
 DELIMITER $$