Oracle Apex: Master detail with adjustable sequence

Tags:
Oracle
Oracle Apex
Hi guys, I have a master / detail table, however I’m trying to apply a sequence to the detail section. Master table contains
M_ID, DATE, PER_ID

1, 01-May-15, 1

2, 01-May-15, 2
Detail
D_ID, M_ID(FK), SEQ, ACCOUNT_ID, TASK_ID, HRS, TRAVEL_HRS
The sequence needs to increase each time a job is requested/created, however have the ability to change its order.
For Each job this must start from 1.
Once the SEQ is set. I will then need to go update all current records retrospectively .Hope this makes sense.


Software/Hardware used:
oracle 11g
0

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