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Is there a way to "split" one row into multiple rows?
My problem is that I have table of edges where patternID is the id of the edge and sourceStationID and targetStationID are the ids that the edge connects:
Patterns:
patternID | sourceStationID | targetStationID
1|1|2
2|1|6
3|1|3
4|1|4
5|4|6
6|5|6
I also have table of Hubs where I can transfer:
Hubs:
hubID
4
5
I need to get out of those data patternIDs that connect stations 1->6 exactly via one hub. So the result of query should be:
4
6
I did that by joining patterns table with hubs table and again with patterns table so i get:
patternID | sourceStationID | targetStationID | patternID | sourceStationID | targetStationID
4 | 1 | 4 | 5 | 4 | 6
How can I split this row into two rows?
asked 2 mins ago
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