Is there any better option than this slow query?

Question

Hi all,
i want to find out lets say Ticekt no range from Variable1 - Variable 2, are all ready existed or missing from my ticket master table which is having a million records and the no grows timely.
For example i want to find out in range 30000 - 50000
if any missings it should give missing number are
34567
45678 etc . etc.
i wrote a for.. loop and im checking one bye one from ticket master table using select count(*) from ticket_master where ticket_no = var, which is time consuming and server becoming slow when i issue this query. my ticket master ticket_no is indexed.
any better idea advise please..

Answer 1

I am not sure I understand your problem correctly.
Here are some test datas:
create table ticket_masters ( ticket_no number) ;
exec for i in 1..1000 loop insert into ticket_masters values (round(i/0.97)); end loop
select 200-1+rownum missing from ticket_masters where rownum<=300-200
  minus
select ticket_no from ticket_masters where ticket_no between 200 and 300
   MISSING
       217
       250
       283i am select rownum from ticket_masters, but I could select from anything actually, a pl/sql table, dual group by cube(1,1,1,1,1,1,1,1,1,1), all_objects, ...
Could you please do a desc ticket_masters to show me your datatype and also select a few ticket_no
Regards
Laurent