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Do underscores in table names affect performance or cause issues on some platforms?
For example, user_profiles
Would it be better to use userProfiles or is it just a matter of personal preference?
Nope. Underscores are perfectly legal in table names.
This page here in the MySQL documentation tells you about what characters are allowed.
Basically:
Personally I tend to stick with lowercase a-z, the occasional number, and underscores.
But as @Vince said, it’s just personal preference.