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MySQL query - latest month/year

My SQL isn't the greatest, obviously, but what I'm trying to do is get the latest date in a database by finding the maximum year and month in an entry. Right now I have:

select max(Month), max(Year) from posts where postID = 25;

...but that results in the latest month and the latest year, though they're not part of the same entry. How can I make sure month and year are from one entry and not separate?

SELECT Month, Year FROM posts WHERE postID = 25 ORDER BY Year DESC, Month DESC LIMIT 1

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