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For example, a smartphone might have attributes such as RAM and camera resolution, whereas a fridge has way different attributes. Is there a way to store these data in a relational database?

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  • Read about EAV pattern.
    – Akina
    Dec 5, 2019 at 16:24
  • There's good and bad ways to do EAV, so keep in mind which data needs to be searched for and which is just retrieved. Note MySQL-8.0 and MariaDB-10.2(?) you can create virtual columns and index expressions on these.
    – danblack
    Dec 5, 2019 at 21:07

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You probably have some columns that are common to almost all products: Price, SKU, Manufacturer, etc. Those may as well be columns. The rest can be put into a JSON string. More discussion: http://mysql.rjweb.org/doc.php/eav

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