尝试这个：
DELETe FROM posts WHERe id not in ( SELECt * FROM ( SELECt id FROM posts ORDER BY timestamp desc limit 0, 15 ) as t);
尝试这个：
DELETe FROM posts WHERe id not in ( SELECt * FROM ( SELECt id FROM posts ORDER BY timestamp desc limit 0, 15 ) as t);
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