TABLES


create table customer(
cid number(4) primary key,
cname varchar(12) not null,
csurname varchar(12) not null,
cadress varchar(12) not null,
cphone number(8) not null)
;


create table staff(
sid number(4) primary key,
sname varchar(12),
ssurname varchar(12),
sadress varchar(12),
sposition varchar(12),
sphone number(8),
salary number(8))
;


create table insurance(
insid number(4) primary key,
year_from number(4) not null,
year_to number(4) not null,
cid number(4) references customer,
sid number(4) references staff,
price number(12) not null)
;


create table car(
carid number(4) primary key,
car_brand varchar(12) not null,
car_colour varchar(12) not null,
cid number(4) references customer)
;


create table recent_customers(
cid number(4) not null,
cname varchar(12) not null,
csurname varchar(12) not null,
cadress varchar(12) not null,
cphone number(8) not null)
;


create table SAL(
ids NUMBER(4) PRIMARY KEY ,
losal NUMBER(7,2) not null, 
hisal NUMBER(7,2) not null, 
position varchar2(12) not null
);


#####################################################################################
TRIGGERS

set serveroutput on


create or replace trigger ChangeCust
after delete 
on customer
for each row
begin
insert into recent_customers values(
:old.cid,
:old.cname,
:old.csurname,
:old.cadress,
:old.cphone);
end;
/


create or replace trigger AddCustomer
after insert
on customer
begin
dbms_output.put_line('A NEW CUSTOMER ADDED');
end;
/



create or replace trigger InsuranceIndex
before insert 
on insurance
for each row
begin
select nvl(max(i.insid)+1,1)
into :new.insid
from insurance i;
end;
/



create or replace trigger CheckPrice
before insert or update
on insurance 
for each row
begin
if (:new.price < 1)then
Raise_application_error(-20000,'WRONG PRICE ENTERED!');
end if;
end;
/


create or replace trigger DontDelete
before delete
on insurance
for each row
begin
Raise_application_error(-20001,'YOU CANT DELETE AN INSURANCE!!!');
end;
/



create or replace trigger SalUpdate
after update
on staff
for each row
begin
if(:new.salary < :old.salary) then
dbms_output.put_line('WARNING!!! NEW SALARY IS LOWER THAN OLD SALARY!!!');
end if;
end;
/




####################################################################################3
PROCEDURES




create or replace procedure RaiseSalary(idin number, adding number) 

AS

empty exception;
change_grade exception;
ile integer;
salary integer (7,2);
my_pos varchar2(20);
my_losal integer;
my_hisal integer;
my_sal integer;

BEGIN
select count(*) into ile from staff where staff.sid=idin;

if ile != 1 then raise empty;

else
select sposition,salary into my_pos,my_sal from staff where sid=idin;
select s.losal, s.hisal into my_losal, my_hisal from sal s where s.position=my_pos;
if my_sal+adding>my_hisal or my_sal+adding<my_losal then raise change_grade;

else

update staff set salary=salary+adding; 
end if;
end if;
exception
when empty then
dbms_output.put_line('Not exists');
when change_grade then
dbms_output.put_line('Changing grade not allowed!');
end;
/


________________________________________________________________________________________


create or replace procedure Addcustom(
Cname IN customer.cname%type,
Csurname IN customer.csurname%type,
Cadress IN customer.cadress%type,
Cphone IN customer.cphone%type)

AS

thesame exception;
counter integer;
Cid customer.cid%type;

BEGIN

select count(*) into counter from customer c where c.csurname=Csurname;
if counter != 0
then raise thesame;
end if;
select NVL(max(customer.cid)+1,1) into Cid
from customer;

insert into customer
values(Cid,Cname,Csurname,Cadress,Cphone);
exception
when thesame then
dbms_output.put_line('Warning! The same surname exists!!');

end;
/

________________________________________________________________________________________

create or replace procedure twolowest(param NUMBER)
AS 
cursor salaries is
select sname,ssurname,salary from staff order by salary;
my_salaries salaries%rowtype;
counter INTEGER;
no_workers exception;
BEGIN 
select count(*) into counter from staff;
if counter=0 then raise no_workers;
else
DBMS_output.put_line('LOWEST EARNINGS:');
open salaries;
fetch salaries into my_salaries;
DBMS_output.put_line('1:'||my_salaries.sname||' '||my_salaries.ssurname||' '||my_salaries.salary||'.');
fetch salaries into my_salaries;
DBMS_output.put_line('2:'||my_salaries.sname||' '||my_salaries.ssurname||' '||my_salaries.salary||'.');
close salaries;
END IF;
EXCEPTION
when no_workers then
DBMS_output.put_line('YOU SHOULD HAVE AT LEAST 2 STAFF WORKERS IN DataBase');
END;

/