PL/SQL :: Converting A Row Into Columns Values?

I have a row which contains 6 columns where I want that data to be shown in the form of columns as shown here:

From:

select item1, item2, item3, amt1, amt2, amt3 from item_table where sno=1; <----- returns 1 row as below

ITEM1 ITEM2 ITEM3 AMT1 AMT2 AMT3
---------- ------------ ------------- ----------- ------------ ----------
AAA BBB CCC 10.00 20.00 15.00

Data explanation: item1's (AAA) price is amt1 (10.00), item2's (BBB) price is amt2 (20.00) and item3's (CCC) price is amt3 (15.00). OK.

Now I want that data to convert into columns as shown here:

To:

ITEMS AMT
--------- ---------
AAA 10.00
BBB 20.00
CCC 30.00

I want a SQL to display this data.

I found one query which converts a row into columns, but this does not serve my requirement: [for your reference only]

SQL> select substr( the_string
, decode( level, 1, 1, instr(the_string,',',1,level-1)+1)
, decode( instr(the_string,',',1,level), 0, length(the_string), instr(the_string,',',1,level) - decode( level, 1, 0, instr(the_string,',',1,level-1))-1)
) the_value
from ( select (select item1||','||item2||','|| item3 from item_table where sno=1) ITEMS
from DUAL)
connect by level <= length(the_string)-length(replace(the_string,','))+1