SQLite "split" row into multiple rows - mysql

Question

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
5
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?
edit:
Here is code that I use so far:
select t2a.patternID from
(
select * from `patterns`
join `hubs` on `targetStationID` = `hubID`
where `sourceStationID` = 1
) as t1a
join
(
select * from `patterns`
join `hubs` on `sourceStationID` = `hubID`
where `targetStationID` = 6
) as t2a
on t1a.hubID = t2a.hubID
union
select t1b.patternID from
(
select * from `patterns`
join `hubs` on `targetStationID` = `hubID`
where `sourceStationID` = 1
) as t1b
join
(
select * from `patterns`
join `hubs` on `sourceStationID` = `hubID`
where `targetStationID` = 6
) as t2b
on t1b.hubID = t2b.hubID;
It's working but I'm using the same select twice.

Answer 1

Updating my answer to hopefully be closer to what you wanted. As far as I understand your question, this seems to give what you requested. The view could be avoided, with its join done in the CTE instead:
C:\Users\DDevienne>sqlite3
SQLite version 3.8.4.3 2014-04-03 16:53:12
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
sqlite> create table edges (id integer primary key autoincrement, beg int, end int);
sqlite> insert into edges (beg, end) values (1, 2), (1, 6), (1, 3), (1, 4), (4, 6), (5, 6);
sqlite> create view edges2 as
...> select start.id as beg_id, start.beg as beg, start.end as hub, finish.id as end_id, finish.end as end
...> from edges start, edges finish
...> where start.end = finish.beg;
sqlite> .headers on
sqlite> select * from edges2;
beg_id|beg|hub|end_id|end
4|1|4|5|6
sqlite> create table hubs (id integer primary key);
sqlite> insert into hubs values (4), (5);
sqlite> with hub_edges(beg_id, beg, hub, end_id, end) as (
...> select edges2.* from edges2, hubs where edges2.hub = hubs.id
...> )
...> select beg_id as id, beg, hub as end from hub_edges
...> union all
...> select end_id as id, hub as beg, end from hub_edges;
id|beg|end
4|1|4
5|4|6
sqlite>
Warning: This requires the latest SQLite (3.8.4.3), and won't work with 3.8.3.x