add triggers Krzysztof

SQL stuff/Krzysztof_Rudnicki-EDABA_Lab-3.sql

@@ -1 +1,96 @@
---Krzysztof Rudnicki 307585 - EDABA Lab 3
+-- Author: Krzysztof Rudnicki
+-- Student number: 307585
+
+--=======================insert_trigger=======================
+
+-- show data
+-- show competition which reputation was affected by attendance of the newly inserted match
+select * from competition where id = 1
+-- show match who is inserted and by that affects competition reputation
+select * from match where id = 1234567
+
+-- create trigger
+-- set competition reputation equal to max (5) reputation if the match in this competition was attended by at least 10k people, and to 1 otherwise
+CREATE OR REPLACE trigger match_insert_trigger after insert on match
+for each row
+begin
+    update competition
+    set reputation = 5
+    where id = :NEW.competition_id AND :NEW.attendance > 10000;
+    
+    update competition
+    set reputation = 1
+    where id = :NEW.competition_id AND :NEW.attendance < 10000;
+end;
+
+-- trigger trigger
+-- insert
+-- sufficient (at least 10k attendance) to change competition reputation
+insert into match
+values(1234567, 10, 5, 30000, 'sunny', 90, To_date(TRUNC(DBMS_RANDOM.VALUE(TO_CHAR(DATE '1900-01-01','J') ,TO_CHAR(DATE '2023-12-31','J'))), 'J'), 'referre', 1)
+
+-- insufficient (less than 10k attendance) to change competition reputation
+insert into match
+values(1234567, 10, 5, 3000, 'sunny', 90, To_date(TRUNC(DBMS_RANDOM.VALUE(TO_CHAR(DATE '1900-01-01','J') ,TO_CHAR(DATE '2023-12-31','J'))), 'J'), 'referre', 1)
+
+delete from match where id = 1234567
+
+--=======================update_trigger=======================
+
+-- Run before/after trigger
+-- show club affected by update trigger when manager reputation influences club reputation
+select * from club where manager_id = 1
+-- show manager which update influences club reputation
+select * from manager where id = 1
+
+
+-- Run to create trigger
+-- updates club reputation if the competition the club is taking part in has high enough prize value
+CREATE OR REPLACE trigger update_maanger_trigger after update on manager
+for each row
+begin
+    update club
+    set reputation = :NEW.reputation
+    where id = :NEW.club_id;
+end;
+
+-- Run to trigger trigger
+-- update
+-- update manager reputation to 1 and trigger update for club to set reputation to 1
+update manager
+    set reputation = 1
+where id = 1;
+
+-- update manager reputation to 5 and trigger update for club to set reputation to 5
+update manager
+    set reputation = 5
+where id = 1;
+
+
+
+--=======================delete_trigger=======================
+
+-- show data
+-- show competition which reputation was affected by attendance of the newly inserted match
+select * from competition where id = 1
+-- show match who is inserted and by that affects competition reputation
+select * from match where id = 1234567
+
+-- create trigger
+-- set competition reputation equal to min (1) reputation if the match deleted from competition was attended by at least 10k people, and to 5 otherwise
+CREATE OR REPLACE trigger match_delete_trigger after delete on match
+for each row
+begin
+    update competition
+    set reputation = 1
+    where id = :OLD.competition_id AND :OLD.attendance > 10000;
+end;
+
+-- trigger trigger
+-- insert
+-- sufficient (at least 10k attendance) to change competition reputation
+insert into match
+values(1234567, 10, 5, 30000, 'sunny', 90, To_date(TRUNC(DBMS_RANDOM.VALUE(TO_CHAR(DATE '1900-01-01','J') ,TO_CHAR(DATE '2023-12-31','J'))), 'J'), 'referre', 1)
+
+delete from match where id = 1234567
+