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Surrogate keys in logical model

ZiutAug 9 2017 — edited Nov 24 2017

Hello

I have simple LM with N:M relation:

pic1.JPG

This relation (e1_e2) has properties:

   ![pic2.JPG](https://objectstorage.us-phoenix-1.oraclecloud.com/p/BqK85Rn1zA5MP0vYiqbAdPgs7Z6OmMxw8SD3WCFVm5kY8uReidZ1KPIKkgJ1hCkG/n/axciphqpnohg/b/forums-legacy/o/uploads/jive_attachments/8/1/6/81650454egami.jpeg)

      ![pic3.JPG](https://objectstorage.us-phoenix-1.oraclecloud.com/p/BqK85Rn1zA5MP0vYiqbAdPgs7Z6OmMxw8SD3WCFVm5kY8uReidZ1KPIKkgJ1hCkG/n/axciphqpnohg/b/forums-legacy/o/uploads/jive_attachments/9/1/6/91650454egami.jpeg)

After engineering to RM I have:

          ![pic4.JPG](https://objectstorage.us-phoenix-1.oraclecloud.com/p/BqK85Rn1zA5MP0vYiqbAdPgs7Z6OmMxw8SD3WCFVm5kY8uReidZ1KPIKkgJ1hCkG/n/axciphqpnohg/b/forums-legacy/o/uploads/jive_attachments/1/2/6/12650454egami.jpeg)

....but I would like to have:

      ![pic5.JPG](https://objectstorage.us-phoenix-1.oraclecloud.com/p/BqK85Rn1zA5MP0vYiqbAdPgs7Z6OmMxw8SD3WCFVm5kY8uReidZ1KPIKkgJ1hCkG/n/axciphqpnohg/b/forums-legacy/o/uploads/jive_attachments/2/2/6/22650454egami.jpeg)

...where id_e1_e2 is surrogate key.

How to do it?

Regards

Ziut
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Locked on Dec 22 2017
Added on Aug 9 2017
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