Are salts useless for security if the attacker knows them?

Question

Let\'s say I have a table of users set up like this:

CREATE TABLE `users` (
    `id` INTEGER PRIMARY KEY,
    `name` TEXT,
    `hashed_password` TEXT,
    `salt`         


        

Answer 1

If an attacker knows the salt, the hashed password and the hash algorithm, then they can mount a brute-force dictionary attack (or rainbow attack).