取消透视表SQL Oracle

Question

I've read a few posts and could not come up with a solution.

I have the following answers table. ID 184 will have an unknown number of entries, so hard-coding each amount and name is not an option.

ID TEXT TAG ORD 184 Halifax Bnk 1 184 RBS Bnk 2 184 Natwest Bnk 3 184 32.16 Amt 1 184 80.15 Amt 2 184 62.54 Amt 3

I need the following output based on TAG and ORD I need to list Bank & Amount.

Bank Amount Halifax 32.16 RBS 80.15 Natwest 62.54

My code so far...

select *  
from 
(select
f.id as "ID"
,a.text as "01TEXT"
,a.tag as  "02TAG"
,a.ord as "03ORD"
from
freq f

left join answers a
on a.freq_id = f.id and a.tag in ('Bnk','Amt')

where
f.id = 184
)unpivot (amount for tag in ("03ORD"))

Any help would be much appreciated. Thanks Genzz

Answer 1

You don't need to UNPIVOT that data. You need to PIVOT it. This gives you the results you are asking for:

with test_data as (
SELECT 184 ID,     'Halifax' text,   'Bnk' tag,     1 ord from dual union all
SELECT 184 ID,     'RBS' text,   'Bnk' tag,     2 ord from dual union all
SELECT 184 ID,     'Natwest' text,   'Bnk' tag,     3 ord from dual union all
SELECT 184 ID,     '32.16' text,   'Amt' tag,     1 ord from dual union all
SELECT 184 ID,     '80.15' text,   'Amt' tag,     2 ord from dual union all
SELECT 184 ID,     '62.54' text,   'Amt' tag,     3 ord from dual
)
select bank_name, amount from test_data
pivot ( max(text) for tag in ('Bnk' as bank_name, 'Amt' as amount) )
order by ord

Only the last 3 lines are of interest to you. The test_data SQL is just to give a working example without having access to your tables.

Answer 2

here is another way

select

f.text  as "Bank"
,a.text as "Amount"
from  answers f
left join answers a
on a.id = f.id 
and a.tag ='Amt'
and a.ord = f.ord

where
f.id = 184
and f.tag = 'Bnk'