Question

I have a table containing numbers, range between 1-1000 they are unique, but I need to identify which of the number are missing in the range 1-1000 from the table using Oracle SQL,

1,3,4,5,6,8,9,10

result 2,7

Could anyone help with a script or URL to a script.?

Answer 1

You could use:

select level from dual
connect by level<=1000
minus
select mycolumn from mytable

EDIT:

To find out which numbers are missing from the sequence without hardcoded 1000:

select level from dual
connect by level < (select max(mycolumn) from mytable)
minus
select mycolumn from mytable