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Dynamics 365 Community / Forums / Microsoft Dynamics AX (Archived) / Derived table structur...
Microsoft Dynamics AX (Archived)

Derived table structure in SQL server

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Posted on by Community Member

Hi,

I just started learning AX 2012.

And I created a base table TabPet which has field InstanceRelationType and PetBirthDate, and a derived table TabPetDog which has field NumberOfTeeth.

And I have setup the InstanceRelationType and Extends property for these two tables.

After I inserted some sample data through X++, I went to SQL server to open the tables. only TabPet table has all the fields includes NumberOfTeeth. TabPetDog table only has some columns like DATAARIEAID, RECVERSION, RELATIONTYPE, PARTITION, RECID.

Can anyone tell me why it's like this? Is it how AX designed?

Thanks a lot,

JIm

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  • Verified answer
    Mea_ Profile Picture
    Mea_ 60,284 on at

    Hi Jim Chi,

    Yep it's how AX designed, in early versions on AX 2012  you had one SQL table per one AX table, but in case of big hierarchies AX had to join bunch of tables that cause performance issues, so it was redesign to store everything in one big table where InstanceRelationType  filed specifies "type" of current record.  

  • Suggested answer
    Community Member Profile Picture
    Community Member on at

    Thank you very much!

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