The query looks for any special
characters in column field (specially useful for password field) and
reports it.
SELECT DISTINCT employee,PASSWORD FROM (SELECT employee,LENGTH(TRIM(TRANSLATE(password, 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789', ' '))) KEY,PASSWORD FROM table_name) WHERE KEY IS NOT NULL