Oracle : SQL Request with a Group By and a Percentage on two differents tables - sql

Question

I'm currently blocked on an complex request... (with a join) :
I have this table "DATA":
order | product
----------------
1 | A
1 | B
2 | A
2 | D
3 | A
3 | C
4 | A
4 | B
5 | Y
5 | Z
6 | W
6 | A
And this table "DICO":
order | couple | first | second
-------------------------------
1 | A-B | A | B
2 | A-D | A | D
3 | A-C | A | C
4 | A-B | A | B
5 | Y-Z | Y | Z
6 | W-A | W | A
I would like to obtain, on one line :
order | count | total1stElem | %1stElem | total2ndElem | %1ndElem
------------------------------------------------------------------
A-B | 2 | 5 | 40% | 2 | 100%
A-D | 1 | 5 | 20% | 1 | 100%
A-C | 1 | 5 | 20% | 1 | 100%
Y-Z | 1 | 1 | 100% | 1 | 100%
W-A | 1 | 1 | 100% | 5 | 20%
I'm totally blocked on the jointure part of my request. Somebody can help me ?

Answer 1

Without any joins - just using UNPIVOT and PIVOT:
Oracle Setup:
CREATE TABLE DICO ( "order", couple, first, second ) AS
SELECT 1, 'A-B', 'A', 'B' FROM DUAL UNION ALL
SELECT 2, 'A-D', 'A', 'D' FROM DUAL UNION ALL
SELECT 3, 'A-C', 'A', 'C' FROM DUAL UNION ALL
SELECT 4, 'A-B', 'A', 'B' FROM DUAL UNION ALL
SELECT 5, 'Y-Z', 'Y', 'Z' FROM DUAL UNION ALL
SELECT 6, 'W-A', 'W', 'A' FROM DUAL;
Query:
SELECT "order",
"count",
"1stElem_TOTAL" AS Total1stElem,
100*"count"/"1stElem_TOTAL" AS "%1stElem",
"2ndElem_TOTAL" AS Total2ndElem,
100*"count"/"2ndElem_TOTAL" AS "%2ndElem"
FROM (
SELECT couple AS "order",
key,
COUNT(*) OVER ( PARTITION BY COUPLE )/2 AS "count",
COUNT(*) OVER ( PARTITION BY VALUE ) AS num_value
FROM DICO
UNPIVOT ( Value FOR Key IN ( first AS 1, second AS 2 ) )
)
PIVOT ( MAX( NUM_VALUE ) AS Total FOR key IN ( 1 AS "1stElem", 2 AS "2ndElem" ) );
Results:
order count TOTAL1STELEM %1stElem TOTAL2NDELEM %2ndElem
----- ----- ------------ -------- ------------ --------
A-D 1 5 20 1 100
A-B 2 5 40 2 100
A-C 1 5 20 1 100
Y-Z 1 1 100 1 100
W-A 1 1 100 5 20