FIRST MISSING NO

Question

IN A LIST OF NUMBERS
1 2 3 4 5 6 10
NOS 7 8 9 ARE MISSING
HOW TO FIND THE FIRST MISSING NO TAT IS HOW TO FIND 7.
PLEASE ANYBODY HELP ME

Answer 1

Alternative method without using analytical functions...
SQL> ed
Wrote file afiedt.buf
  1  with t as
  2    (select 1 no from dual
  3  union select 2 from dual
  4  union select 3 from dual
  5  union select 4 from dual
  6  union select 5 from dual
  7  union select 6 from dual
  8  union select 10 from dual
  9    )
10  -- end of test data
11  select min(no)
12  from (
13    select rownum no from dual connect by rownum <= (select max(no) from t)
14    minus
15    select no from t
16*   )
SQL> /
   MIN(NO)
         7
SQL>