Oracle SQL multi-level pivot groups - oracle

Question

EDIT: To those saying this is a clear & obvious "No": Sure, I figured that was the case, and hierarchical headers were beyond the scope of SQL query results. However, apart from some Mysql work, I've just made the jump from an old legacy SQL Server 2000 platform to Oracle 12g, and finding things there that I could never have imagined doing in SS 2000, so I thought I'd ask. I write loads of SQL to feed my presentation layer in a few report creation systems, and so I'm exploring this leap forward in capabilities from SS 2000.
I may be asking too much of the Oracle Pivot function, but this is what I'm trying to do. I can pivot at a single level but I want a hierarchy of column grouping with multiple measures the way you could easily do in a spreadsheet crosstab. Here's sample data & desired output:
select *
from(
select 'A' rws, 'X' cols, 2 v1, 90 v2 from dual union
select 'A' rws, 'Y' cols, 25 v1, 112 v2 from dual union
select 'A' rws, 'Y' cols, 7 v1, 64 v2 from dual union
select 'B' rws, 'X' cols, 4 v1, 117 v2 from dual union
select 'B' rws, 'Y' cols, 46 v1, 32 v2 from dual union
select 'B' rws, 'X' cols, 0 v1, 18 v2 from dual
)
Here is the output I would like:
-----------------------------------------------------------
| A | B |
-----------------------------------------------------------
| X | Y | X | Y |
-----------------------------------------------------------
| v1 | v2 | v1 | v2 | v1 | v2 | v1 | v2 |
-----------------------------------------------------------
| 2 | 90 | 32 | 176 | 4 | 135 | 46 | 32 |
-----------------------------------------------------------

Answer 1

Of course, you can pivot data as you want, but you need to format header yourself, since onviously Oracle return standard table data:
select *
from(
select 'A' rws, 'X' cols, 2 v1, 90 v2 from dual union
select 'A' rws, 'Y' cols, 25 v1, 112 v2 from dual union
select 'A' rws, 'Y' cols, 7 v1, 64 v2 from dual union
select 'B' rws, 'X' cols, 4 v1, 117 v2 from dual union
select 'B' rws, 'Y' cols, 46 v1, 32 v2 from dual union
select 'B' rws, 'X' cols, 0 v1, 18 v2 from dual
) t
pivot
(
max(v1) as v1_,max(v2) as v2_
for (rws,cols) in (
('A','X') as A_X,
('A','Y') as A_Y,
('B','X') as B_X,
('B','Y') as B_Y
)
);
Result:
A_X_V1_ A_X_V2_ A_Y_V1_ A_Y_V2_ B_X_V1_ B_X_V2_ B_Y_V1_ B_Y_V2_
---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
2 90 25 112 4 117 46 32

Answer 2

You can use the conditional aggregation as follows:
SQL> SELECT SUM(CASE WHEN RWS = 'A' AND COLS = 'X' THEN V1 END) AS AXV1,
2 SUM(CASE WHEN RWS = 'A' AND COLS = 'X' THEN V2 END) AS AXV2,
3 SUM(CASE WHEN RWS = 'A' AND COLS = 'Y' THEN V1 END) AS AYV1,
4 SUM(CASE WHEN RWS = 'A' AND COLS = 'Y' THEN V2 END) AS AYV2,
5 SUM(CASE WHEN RWS = 'B' AND COLS = 'X' THEN V1 END) AS BXV1,
6 SUM(CASE WHEN RWS = 'B' AND COLS = 'X' THEN V2 END) AS BXV2,
7 SUM(CASE WHEN RWS = 'B' AND COLS = 'Y' THEN V1 END) AS BYV1,
8 SUM(CASE WHEN RWS = 'B' AND COLS = 'Y' THEN V2 END) AS BYV2
9 FROM YOUR_TABLE;
AXV1 AXV2 AYV1 AYV2 BXV1 BXV2 BYV1 BYV2
---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
2 90 32 176 4 135 46 32
SQL>
Showing the multi-line headers must be taken care from application side.