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If I have a column names called category_id and Category_Id, are they different?
And if I have table called category and Category, are they different?
On Unix, table names are case sensitive. On Windows, they are not. Fun, isn’t it? Kinda like their respective file systems. Do you think it’s a coincidence?
In other words, if you are developing on Windows but planning on deploying to a Linux machine, better test your SQL against a Linux-based MySQL too, or be prepared for mysterious "table not found" errors at prod time. VMs are cheap these days.
Field (column) names are case-insensitive regardless.
EDIT: we’re talking about the operating system on the MySQL server machine, not client.