Report On Missing Invoice

Question

Dear All,
i want to create an report which has all missing invoice no (e.g November invoice posted were from 1000001 to 1000100 how do we check if all the invoices has been entered)
Table INVOICE_MASTER
Column NAMe
Invoice no
Invoice date
Invoice Type
How can i create that report.
Thanks

Answer 1

Sample: How to find gaps in a sequence with CTE
with testdata as (
  select 1000000 + 2*level inv from dual
  connect by level < 51
, r (n, i) as (
select min(inv) n, 0 inv from testdata
union all
select n + 1, inv
from r, testdata
where
r.n+1=inv(+)
select * from r
where
i is null
N     I
1000003     -
1000005     -
1000007     -
1000009     -
1000011     -
1000013     -
1000015     -