Deleting a row based on the max value

Question

How can I structure a mySQL query to delete a row based on the max value.

I tried

WHERE jobPositonId = max(jobPostionId)

but got

Answer 1

This works:

SELECT @lastid := max(jobPositonId ) from t1; 
DELETE from t1 WHERE jobPositonId = @lastid ; 

Other than going to the database twice, is there anything wrong with this technique?