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Editorial Team
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Asked: 2026-05-20T22:17:20+00:00

I asked this question , and someone suggested this type of schema. I’m not

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I asked this question, and someone suggested this type of schema. I’m not familiar with how super/subtypes work. Can you show me a TSQL example of how I would create this database?

Another problem I’m having trouble wrapping my head around, is given an order, and a collection of items in that order, how would I know if an item is a Pizza, Beverage or Side dish?

Thank you.

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1 Answer

  1. Editorial Team

    Tables:

    ITEM_SUPER_TYPE

    • ITEM_SUPER_TYPE_ID (pk, IDENTITY)
    • DESCRIPTION

    ITEM_SUB_TYPE

    • ITEM_SUB_TYPE_ID (pk, IDENTITY)
    • ITEM_SUPER_TYPE_ID (fk to ITEM_SUPER_TYPE.ITEM_SUPER_TYPE_ID)
    • DESCRIPTION

    ITEM

    • ITEM_ID
    • ITEM_SUB_TYPE_ID (fk to ITEM_SUB_TYPE.ITEM_SUB_TYPE_ID)

    This way, the super type can be inferred from the subtype.

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