I have a field capacity in mytable .
I want to sort the fetch data by capacity from smallest to largest
these values are
6" x 12"
6" x 12"
6" x 18"
6" x 12"
10" x 20"
12" x 24"
I want this results
6" x 12"
6" x 12"
6" x 12"
6" x 18"
10" x 20"
12" x 24"
if I using this query
select * from mytable order by capacity ASC
than the result is
10" x 20"
12" x 24"
6" x 12"
6" x 12"
6" x 12"
6" x 18"
if I using this query
select * from mytable order by capacity + 0 ASC
than the result is
6" x 12"
6" x 12"
6" x 18"
6" x 12"
10" x 20"
12" x 24"