sql date operation split

can greatfully let me know sql separate date ranges overlap?

data (sample information date operation presumably columns):

    col1 fromdate todate
 1. 1    1/1/2008 31/12/2010
 2. 1    1/1/2009 31/12/2012
 3. 1    1/1/2009 31/12/2014

output:

   col1  date todate
1. 1     1/1/2008 31/12/2008 (from quarrel 1 above)
2. 1     1/1/2009 31/12/2010 (from rows 1,2 3 above)
3. 1     1/1/2011 31/12/2012 (from rows 2 3 above)
4. 1     1/1/2013 31/12/2014 (from quarrel 3 above)