@talebmakrani I would have a look at the following Design Blog post and the following Help Doc links for further guidance, that should put you on the right track:
https://community.qlik.com/t5/Qlik-Design-Blog/Synthetic-Keys/ba-p/1472634
https://help.qlik.com/en-US/sense/November2020/Subsystems/Hub/Content/Sense_Hub/DataModeling/best-pr...
Regards,
Brett
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