getWhat = async (what, id) => {
  let s = await db.query(`SELECT ${what} FROM users WHERE id=? LIMIT 1`, [id])
  return s[0][what]
}
Returns [what] of user ID

eq. getWhat('username', id) => id's username

@param {String} what Eq. Username
@param {String} id ID to be used to return [what]