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Every time you need a new format you'll have to modify your table schema. That's not a good thing. There is no exhaustive list of formats you can rely on, which means you are coming up with this list on your own and deciding "yeah, I think that's all of them". That's not a good thing. If there's 20 different media formats then you've got an ENUM with 20 different entries. That's not a good thing. It's the same problem as you had with the list of genres.