how to get values not present in the inlist

[zulu99]

hi

i have a table t (col number);

with say 5 values
1
2
3
4
5

when i query select * from t where col in (1,2,3);
it will
output
1
2
3


what i wnat is something like this
when i query select * from t where col in (1,2,3,6,7);

it should give me
6
7

values which are not part of the table


Rgrds
Sushant