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i want to ask a small question here but i really don’t know what is the answer of this question.
i have a accounts table which has
Username | Password
the username is a primary key so its unique
so is it necessary to put an ID column to the table ? if Yes, what is the benefit of that ?
Thanks
Search by a numeric key is slightly faster (varies from one DB to another). Also, if you have a lot of references to the user table, you save some database space by having the numeric ID as the foreign key, as opposed to a string name.