BEGIN
FOR i IN 1..500 LOOP
IF (i<10) THEN
insert into books(bno,bname,price) values('z0000'||i,'XXXX','XXXX');
commit;
elsif(i>=10 and i<100) THEN
insert into books(bno,bname,price) values('z000'||i,'xxxx','xxxx');
commit;
IF(i=50) THEN
update books set price = '0' where bno = 'z0040';
commit;
END IF;
elsif(i>=100)THEN
insert into books(bno,bname,price) values('z00'||i,'xxxx','xxxx');
commit;
END IF;
commit;
END LOOP;
commit;
END;