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oracleplsqlcombinationshierarchical-query

Another Combination

Very similar to my last question, now I want only the, "full combination," for a group in order of priority. So, from this source table:

+-------+-------+----------+
| GROUP | State | Priority |
+-------+-------+----------+
|   1   |  MI   |     1    |
|   1   |  IA   |     2    |
|   1   |  CA   |     3    |
|   1   |  ND   |     4    |
|   1   |  AZ   |     5    |
|   2   |  IA   |     2    |
|   2   |  NJ   |     1    |
|   2   |  NH   |     3    |

And so on...

I need a query that returns:

+-------+---------------------+
| GROUP |     COMBINATION     |
+-------+---------------------+
|   1   | MI, IA, CA, ND, AZ  |
|   2   | NJ, IA, NH          |
+-------+---------------------+

Thanks for the help, again!

Solution

  • Use listagg() ordering by priority within the group.

    SELECT "GROUP",
       listagg("STATE", ', ') WITHIN GROUP (ORDER BY "PRIORITY")
       FROM "ELBAT"
       GROUP BY "GROUP";

    db<>fiddle