>hi,
>thank you for reply,
>i see the result is..
>1.5xzzwa19
>1c/xw.501f.....after index it must be
>------------------------------
>1c/x...
>1.5x.....
>----------------------------
>if i have ex..
>100a
>11a
>10a
>1a....after index it must be
>----------------------
>1a
>10a
>11a
>100a

Your sorting scheme is non-standard (e.g. not ASCI indexing) as you want

1a
10a
11a
100a

In that case unfortunately you would have to add another field (column) with the sorting order to tell it how to sort as ASCII will always put 10a before 1a.