I have a MySQL table with a varchar column that represents sections in a catalog. THe entries look like the following

1.1
1.2
2.1
2.7
3.1
3 - 4.4
3 - 4.4
4.1
9.8, 9.9
10.1
12.7

And so on. I want to be able to sort the rows based on this column in some sensical way (Section then subsection), but the entries 3-4.4 and 9.8,9.9 are throwing me off. Any ideas on how I can organize this to b sortable and updatable?