MySQL проверьте, есть ли строчный регистр

-- will detect all names that are not in uppercase
SELECT 
    name, UPPER(name) 
FROM table 
WHERE 
    BINARY name <> BINARY UPPER(name)
;

-- will detect all names that are not in lowrcase
SELECT 
    name, UPPER(name) 
FROM table 
WHERE 
    BINARY name <> BINARY LOWER(name)
;
MeVyom