Getting every odd-numbered row from result set

Question

select *
from mytable
where MOD(rownum,2) = 1;
Why does this not give me every odd-numbered row from result set? It returns just 1 row....
Thank u

Answer 1

When you say MOD(ROWNUM,2)=1 it will list only the first row with rowid which is devisible by 2 and gives a reminder 1.
Just tweak your query with a GROUP BY:
SQL> select rownum from your_table group by rownum having mod(rownum,2) =1;
    ROWNUM
         1
         3
         5
         7
         9
        11
        13
        15
        17
        19
        21
    ROWNUM
        23
        25
        27
        29
        31
        33
        35
        37
        39
        41
        43
etc...
[pre]
Jithendra