Hi folks,
I'm new to SAP HANA and need your help with understanding howGROUPING SETS on HANA works.
By executing of this statement
SELECT COUNTRY, LANGU, "SHORT TEXT",
GROUPING(COUNTRY), GROUPING(LANGU), GROUPING("SHORT TEXT"),
GROUPING_ID(COUNTRY, LANGU, "SHORT TEXT")
FROM COUNTRIES
GROUP BY GROUPING SETS ((COUNTRY, LANGU), (LANGU, "SHORT TEXT"))on this raw table
| COUNTRY | LANGU | SHORT TEXT |
|---|---|---|
| DE | D | Deutschland |
| DE | E | Germany |
| US | D | USA |
| US | E | USA |
I'm getting these results:
| COUNTRY | LANGU | SHORT TEXT | GROUPING(COUNTRY) | GROUPING(LANGU) | GROUPING(SHORT TEXT) | GROUPING_ID |
|---|---|---|---|---|---|---|
| DE | D | ? | 0 | 0 | 1 | 1 |
| US | D | ? | 0 | 0 | 1 | 1 |
| DE | E | ? | 0 | 0 | 1 | 1 |
| US | E | ? | 0 | 0 | 1 | 1 |
| ? | D | Deutschland | 1 | 0 | 0 | 4 |
| ? | E | Germany | 1 | 0 | 0 | 4 |
| ? | D | USA | 1 | 0 | 0 | 4 |
| ? | E | USA | 1 | 0 | 0 | 4 |
Two questions raised here:
- Why is Grouping(...) returning 1 when attribute is NULL and 0 when grouped? Has it not to be reversely?
- And what about Grouping_ID, I have expected to see 1 and 2, but not 4... What are respective rules here?
Regards,
Oleg