sql - Split column to multiple rows

Question

I have table with a column that contains multiple values separated by comma (,) and would like to split it so I get earch Site on its own row but with the same Number in front.

So my select would from this input

table Sitetable

Number             Site
952240             2-78,2-89                                                                                                                                                                      
952423             2-78,2-83,8-34

Create this output

Number             Site
952240             2-78
952240             2-89
952423             2-78 
952423             2-83
952423             8-34

I found something that I thought would work but nope..

select Number, substr(
    Site, 
    instr(','||Site,',',1,seq),
    instr(','||Site||',',',',1,seq+1) - instr(','||Site,',',1,seq)-1)  Site
from Sitetable,(select level seq from dual connect by level <= 100) seqgen
where instr(','||Site,',',1,seq+1) > 0

Edit2: I see that I have actually had a part working select all the time (I was a crappy tester :(), the above one works but the only problem is that it looses the last Site value but Ill try to work a bit on that..

Edit3: Now its working

select Number, substr(
Site, 
instr(','||Site,',',1,seq),
instr(','||Site||',',',',1,seq+1) - instr(','||Site,',',1,seq)-1)  Site
from Sitetable,(select level seq from dual connect by level <= 100) seqgen
where instr(','||Site,',',1,seq) > 0

Answer 1

And the correct answer is.

select Number, substr(
Site, 
instr(','||Site,',',1,seq),
instr(','||Site||',',',',1,seq+1) - instr(','||Site,',',1,seq)-1)  Site
from Sitetable,(select level seq from dual connect by level <= 100) seqgen
where instr(','||Site,',',1,seq) > 0