twitter: [Rails] Multiple select

Is it possible to save multiple select values into one table sell?

<SELECT MULTIPLE SIZE=4>
<OPTION VALUE="A">Option A
<OPTION VALUE="B">Option B
<OPTION VALUE="C">Option C
<OPTION VALUE="D">Option D
</SELECT>

I know, there should be two tables, but... there is 3 miljons rows in
table and 99% of rows has only one select value..

So is it possible to make something like this:

data (id, name, select)

1, "xxxx", "A"
2, "xxxx", "B"
2, "xxxx", "A,B"

Some "hack" to forms and controller?

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