conversion from Mar-2026 to 03-2026 and vice versa

[Smith John]

I am new to PHP & MySQL, struggling to learn the technology (absolute beginner). now I want to convert a VARCHAR column name is SALARY_MONTH, it contains data like: Mar-2025 now I want this in 03-2025 format (vice versa too).
please help to achieve this.

I tried below in PhpMyAdmin Console but it returns NULL.

--- start
SELECT DATE_FORMAT(
STR_TO_DATE('Mar-2025', '%b-%Y'),
'%c-%Y'
) AS result;
--- end

thanks in advance.