SELECT

Okay. Let's say I have a list of usernames in the table users. Let's say I have a list of bad users in the table blacklist. Now, let's say I want to select all the usernames from the table users that are not in the table blacklist? How do I do this? I was thinking of stuff like the following:

select * from users where username not in (select * from blacklist);

but it doesn't work.

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