My table contains a list of shows with showtimes (see below).
cCode cName cDate1, cDate2, cDate3, cDate4, cDate5, cDate6

I want to know how can I offer in a combobox the list of
dates for a selected show. In other words, I want to transpose
the columns in rows (like below).

for cCode="ABC" the result must be:
cDate1
cDate2
cDate3
cDate4
cDate5
cDate6

What is the best way to do that?