final Maciek triggers

SQL stuff/Maciej_Domanski-EDABA_Lab-3.sql

@@ -1,70 +1,69 @@
 --Maciej Domañski 303853 - EDABA Lab 3
+----------------------- INSERT TRIGGER -----------------------
 
-
--- Show data before triggers
-select * from competition where id < 10
-select * from club where competition_id = 1
+-- show club which budget was affected by inserting or deleting new/old player
+select * from club where id = 1
+-- show player who is inserted and by that affects club budget
+select * from player where id = 1000000
 
 -- insert trigger creation
+-- after inserting a player increase club budget by player value
+CREATE OR REPLACE trigger insert_player_trigger after insert on player
+for each row
+begin
+    update club
+    set budget = budget + :NEW.transfer_value
+    where :NEW.club_id = id;
+end;
+
+-- insert
+insert into player
+values(1000000, 5, 'striker', 3, 'valid', 5, 35, 1000, 20000000, 1)
+
+----------------------- UPDATE TRIGGER -----------------------
+
+-- Show data that is affected by triggers
+-- show competition where prize was updated which later changes club reputation
+select * from competition where id = 1
+-- show club affected by update trigger when competition prize is high enough
+select * from club where competition_id = 1
 
 -- update trigger creation
+-- updates club reputation if the competition the club is taking part in has high enough prize value
 CREATE OR REPLACE trigger update_trigger after update on competition
 for each row
 begin
     update club
-    set budget = 2000
-    where 20 < :NEW.prize AND :NEW.id = competition_id;
+    set reputation = 5
+    where 200000 < :NEW.prize AND :NEW.id = competition_id;
 end;
 
--- delete trigger creation
-
--- Show data that triggers trigger
-
--- trigger triggers
+-- update
 update competition
-set prize = 1000
+set prize = 1234567
 where id = 1;
 
--- Show data after trigger
-select * from competition where id < 10
-select * from club where competition_id = 1
+
+----------------------- DELETE TRIGGER -----------------------
+
+-- Show data that is affected by triggers
+-- show club which budget was affected by inserting or deleting new/old player
+select * from club where id = 1
+-- select player who is inserted and by that affects club budget
+select * from player where id = 1000000
+
+-- delete trigger creation
+-- after deleting a player decrease club budget by player value
+CREATE OR REPLACE trigger delete_player_trigger after delete on player
+for each row
+begin
+    update club
+    set budget = budget - :OLD.transfer_value
+    where :OLD.club_id = id;
+end;
 
 
-
-
--- NEW - valid only for insert/update
--- OLD - delete/upate 
---CREATE OR REPLACE trigger update_nb_emp after insert or update or delete on emp
---for each row
---begin
---    -- increase number of employes in given department
---    update dept
---    set nb_emp = nb_emp +1 
---    where deptno = :NEW.deptno;
---
---    -- decrease number of employes in given department
---    -- here we do not decrease number of employees if there are no data in department because of OLD  
---    update dept
---    set nb_emp = nb_emp -1 
---    where deptno = :OLD.deptno;
---end;
---
---
---select * from dept;
---select * from emp;
---insert into emp
---values(800, 'John', 'Rambo', 7788,'2022-01-20',7000, 0,40);
---
---update emp
---set deptno = 30
---where empno = 800
---
---delete from emp
---where empno = 800
---
---select * from emp
---
---update dept
---set nb_emp = (select count(*) from emp where emp.deptno = dept.deptno)
---
+-- delete
+delete from player
+where id = 1000000