Question

Im try to update value (level) in in table people if userid exist in users table
in table

  IF EXISTS (SELECT userid FROM users)
  UPDATE people SET level='1'

What i am missing ! to get errors ?

Answer 1

From your comment “i need to update level column if userid exist in both table with value 1”, it seems you need this :

UPDATE
    `people`
SET
    `level` = 1
WHERE
    EXISTS (
        SELECT
            *
        FROM
            `users`
        WHERE
            users.userid = people.userid
    );