MySQL按组前排序
SELECT wp_posts.* FROM wp_posts WHERE wp_posts.post_status='publish' AND wp_posts.post_type='post' GROUP BY wp_posts.post_author ORDER BY wp_posts.post_date DESC
SELECT wp_posts.*FROM wp_postsWHERE wp_posts.post_status='publish' AND wp_posts.post_type='post'GROUP BY wp_posts.post_authorHAVING wp_posts.post_date = MAX(wp_posts.post_date) <- ONLY THE LAST POST FOR EACH AUTHORORDER BY wp_posts.post_date DESC
SELECT wp_posts.* FROM ( SELECT * FROM wp_posts ORDER BY wp_posts.post_date DESC) AS wp_postsWHERE wp_posts.post_status='publish'AND wp_posts.post_type='post'GROUP BY wp_posts.post_author
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