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SELECT DISTINCT YEAR(post_date), MONTH(post_date) FROM posts WHERE post_date < '2021-04-20 12:07:41' AND post_category > 0 ORDER BY post_date DESC
Expression #1 of ORDER BY clause is not in SELECT list, references column 'cafelog_cafelogcom.posts.post_date' which is not in SELECT list; this is incompatible with DISTINCT