How to apply pivot to result of query - sql

Question

There is my current query:
SELECT Name, Code, Today
, Account || Currency as Accounts
FROM (
SELECT
b.description AS Name
, b.contragentidentifycode AS Code
, c.systemday AS Today
, b.accountno AS Account
, b.currencysname AS Currency
FROM vAACCOUNT b, currentdaysetting c
WHERE b.contragentid = 412
AND b.accountno LIKE '26%'
)
it gives me such result:
Name | Code | Today | Accounts
---------------------------------------
name1 | code1 | 07.09.2016 | acc1+curr1
name1 | code1 | 07.09.2016 | acc2+curr1
name1 | code1 | 07.09.2016 | acc1+curr2
name1 | code1 | 07.09.2016 | acc2+curr2
name1 | code1 | 07.09.2016 | acc1+curr3
name1 | code1 | 07.09.2016 | acc2+curr3
name1 | code1 | 07.09.2016 | acc1+curr4
name1 | code1 | 07.09.2016 | acc2+curr4
I need convert this view to:
Name | Code | Today | someName1 | someName2 | someName3 | someName4 | someName5 | someName6 | someName7 | someName8
-------------------------------------------------------------------------------------------------------------------------------------------
name1 | code1 | 07.09.2016 | acc1+curr1 | acc2+curr1 | acc1+curr2 | acc2+curr2 | acc1+curr3 | acc2+curr3 | acc1+curr4 | acc2+curr4
I guess that most probably for this I have to use the keyword "Pivot". But all my attempts to do so - have failed. I can not to project what I see in the examples, to my table. Please help.
For number of columns I can add such "id" column:
SELECT id, Name, Code, Today
, Account || Currency as Accounts
FROM (
SELECT
row_number() over (ORDER BY b.id) AS id
, b.description AS Name
...
In my scenario:
numbers of accounts may be different;
name, code and data - one per query;
combination of accaunt+currency are unique;
result should be in one line;
total number of lines in result of query, cannot be more then 10 (in my example 8)

Answer 1

Per my comment above, I don't think PIVOT works for you. The answer from #RoundFour works, but requires that you know, and code for, all possible values for Account || Currency. This suggests there will never be new values for these items - I find that unlikely.
The following will allow you to switch the shape of your data. It makes no assumptions about the values in your data, but it does assume a limit on the number of possible combinations - I have coded for eight.
WITH account_data (name,code,today,account)
AS
(
SELECT 'name1','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc1+curr1' FROM dual UNION ALL
SELECT 'name1','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc2+curr1' FROM dual UNION ALL
SELECT 'name1','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc1+curr2' FROM dual UNION ALL
SELECT 'name1','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc2+curr2' FROM dual UNION ALL
SELECT 'name1','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc1+curr3' FROM dual UNION ALL
SELECT 'name1','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc2+curr3' FROM dual UNION ALL
SELECT 'name1','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc1+curr4' FROM dual UNION ALL
SELECT 'name1','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc2+curr4' FROM dual UNION ALL
SELECT 'name2','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc1+curr1' FROM dual UNION ALL
SELECT 'name2','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc2+curr1' FROM dual UNION ALL
SELECT 'name2','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc1+curr2' FROM dual UNION ALL
SELECT 'name3','code1',TO_DATE('07.09.2016','DD.MM.YYYY'),'acc2+curr2' FROM dual
)
SELECT
name
,code
,today
,MAX(account1)
,MAX(account2)
,MAX(account3)
,MAX(account4)
,MAX(account5)
,MAX(account6)
,MAX(account7)
,MAX(account8)
FROM
(SELECT
name
,code
,today
,CASE
WHEN rn = 1 THEN account
END account1
,CASE
WHEN rn = 2 THEN account
END account2
,CASE
WHEN rn = 3 THEN account
END account3
,CASE
WHEN rn = 4 THEN account
END account4
,CASE
WHEN rn = 5 THEN account
END account5
,CASE
WHEN rn = 6 THEN account
END account6
,CASE
WHEN rn = 7 THEN account
END account7
,CASE
WHEN rn = 8 THEN account
END account8
FROM
(SELECT
name
,code
,today
,account
,ROW_NUMBER() OVER (PARTITION BY name ORDER BY account) rn
FROM
account_data
)
)
GROUP BY
name
,code
,today
;
UPDATE >>>>>>>>>
The WITH... clause above is just because I don't have your tables and data in my system. I've rewritten my answer using your query as a guide - please note I have not been able to test this ...
SELECT
name
,code
,today
,MAX(account1)
,MAX(account2)
,MAX(account3)
,MAX(account4)
,MAX(account5)
,MAX(account6)
,MAX(account7)
,MAX(account8)
FROM
(SELECT
name
,code
,today
,CASE
WHEN rn = 1 THEN account
END account1
,CASE
WHEN rn = 2 THEN account
END account2
,CASE
WHEN rn = 3 THEN account
END account3
,CASE
WHEN rn = 4 THEN account
END account4
,CASE
WHEN rn = 5 THEN account
END account5
,CASE
WHEN rn = 6 THEN account
END account6
,CASE
WHEN rn = 7 THEN account
END account7
,CASE
WHEN rn = 8 THEN account
END account8
FROM
(SELECT
b.description AS Name
,b.contragentidentifycode AS Code
,c.systemday AS Today
,b.accountno AS Account
,b.currencysname AS Currency
,b.accountno || b.currencysname AS Accounts
,ROW_NUMBER() OVER (PARTITION BY b.description ORDER BY b.accountno) rn
FROM vAACCOUNT b, currentdaysetting c
WHERE b.contragentid = 412
AND b.accountno LIKE '26%'
)
)
GROUP BY
name
,code
,today
;

Answer 2

If you know all the account+currency combinations you can use this pivot (I only implemented 3 of them here):
select *
from (
<your-query> )
pivot (
min(accounts) as accounts FOR (accounts) in ('acc1+curr1' as a, 'acc2+curr1' as b, 'acc1+curr2' c)
);

Answer 3

There is my pivot solution:
SELECT *
FROM (
SELECT id, Name, Code, Today, Account || Currency as Accounts
FROM (
SELECT
row_number() over (ORDER BY b.id) AS id
, b.description AS Name
, b.contragentidentifycode AS Code
, c.systemday AS Today
, b.accountno AS Account
, b.currencysname AS Currency
FROM vAACCOUNT b, currentdaysetting c
WHERE b.contragentid = 412
AND b.accountno LIKE '26%'
)
)
pivot (
MIN(Accounts)
FOR ID IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
) pvt