data in more columns should be get into single column

Question

i have one table like

col_1	col_2	col_3	col_4
aa	dd	gg	jj
bb	ee	hh	kk
cc	ff	ii	ll

 

 

but i want the result as

 

  

Column1	Column2	Column3	Column4
col_1	col_2	col_3	col_4
aa	dd	gg	null
bb	ee	hh	null
cc	ff	ii	null
dd	gg	jj	null
ee	hh	kk	null
ff	ii	ll	null
gg	jj	null	null
hh	kk	null	null
ii	ll	null	null
jj	null	null	null
kk	null	null	null
ll	null	null	null

 

 please any one can answer to this .