Another code to Convert column to row

 Run The Function and find the different of Each Query

create table retail_sale
(
 retail_sale_id number not null
,terminal_id number not null
,sale_date date not null
,currency_category_code varchar2(8) -- base, original
,ttl_amt number
,ttl_dis number
,ttl_tax number
)


select * from retail_sale

create unique index retail_sale_pk on retail_sale (retail_sale_id)
/
create unique index retail_sale_uk1 on retail_sale (terminal_id,sale_date,currency_category_code)
/

alter table retail_sale
   add constraint retail_sale_pk primary key (retail_sale_id)
   add constraint retail_sale_uk1 unique (terminal_id,sale_date,currency_category_code)
/

insert into retail_sale values (1,1,trunc(sysdate),'ORIGINAL',100,20,4.80);
insert into retail_sale values (2,1,trunc(sysdate),'BASE',100*1.17,20*1.17,round(4.8*1.17,2));



select *
from retail_sale
/

select
       terminal_id
      ,sale_date
      ,case when currency_category_code = 'BASE'     then ttl_amt end base_ttl_amt
      ,case when currency_category_code = 'BASE'     then ttl_dis end base_ttl_dis
      ,case when currency_category_code = 'BASE'     then ttl_tax end base_ttl_tax
      ,case when currency_category_code = 'ORIGINAL' then ttl_amt end original_ttl_amt
      ,case when currency_category_code = 'ORIGINAL' then ttl_dis end original_ttl_dis
      ,case when currency_category_code = 'ORIGINAL' then ttl_tax end original_ttl_tax
from retail_sale
/

select
       terminal_id
       ,sale_date
      ,sum(case when currency_category_code = 'BASE'     then ttl_amt end) base_ttl_amt
      ,sum(case when currency_category_code = 'BASE'     then ttl_dis end) base_ttl_dis
      ,sum(case when currency_category_code = 'BASE'     then ttl_tax end) base_ttl_tax
      ,sum(case when currency_category_code = 'ORIGINAL' then ttl_amt end) original_ttl_amt
      ,sum(case when currency_category_code = 'ORIGINAL' then ttl_dis end) original_ttl_dis
      ,sum(case when currency_category_code = 'ORIGINAL' then ttl_tax end) original_ttl_tax
from retail_sale
group by
       terminal_id
      ,sale_date
/


select retail_sale_id
      ,terminal_id
      ,sale_date
      ,currency_category_code
      ,case
           when dollar_type.rowno = 1 then 'TTL_AMT'
           when dollar_type.rowno = 2 then 'TTL_DIS'
           when dollar_type.rowno = 3 then 'TTL_TAX'
       end dollar_name
      ,case
           when dollar_type.rowno = 1 then ttl_amt
           when dollar_type.rowno = 2 then ttl_dis
           when dollar_type.rowno = 3 then ttl_tax
       end amt
from retail_sale
    ,(
      select rownum rowno
      from dual
      connect by level <=3
     ) dollar_type
order by 1,2,3,5



select terminal_id
      ,sale_date
      ,case
           when dollar_type.rowno = 1 then 'TTL_AMT'
           when dollar_type.rowno = 2 then 'TTL_DIS'
           when dollar_type.rowno = 3 then 'TTL_TAX'
       end dollar_name
      ,case
           when dollar_type.rowno = 1 then base_ttl_amt
           when dollar_type.rowno = 2 then base_ttl_dis
           when dollar_type.rowno = 3 then base_ttl_tax
       end base_amt
      ,case
           when dollar_type.rowno = 1 then original_ttl_amt
           when dollar_type.rowno = 2 then original_ttl_dis
           when dollar_type.rowno = 3 then original_ttl_tax
       end usd_amt
from (
      select
             terminal_id
            ,sale_date
            ,sum(case when currency_category_code = 'BASE'     then ttl_amt end) base_ttl_amt
            ,sum(case when currency_category_code = 'BASE'     then ttl_dis end) base_ttl_dis
            ,sum(case when currency_category_code = 'BASE'     then ttl_tax end) base_ttl_tax
            ,sum(case when currency_category_code = 'ORIGINAL' then ttl_amt end) original_ttl_amt
            ,sum(case when currency_category_code = 'ORIGINAL' then ttl_dis end) original_ttl_dis
            ,sum(case when currency_category_code = 'ORIGINAL' then ttl_tax end) original_ttl_tax
      from retail_sale
      group by
             terminal_id
            ,sale_date
     )
    ,(
      select rownum rowno
      from dual
      connect by level <= 3
     ) dollar_type
order by 1,2,3