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我将如何结合这些查询? “已删除”字段是指示何时“删除”主题的时间戳。该主题并未真正被删除。如果它有实际的时间戳,我只是不会显示它。关系数据库查询
$topics = "SELECT id FROM topics WHERE deleted = '0000-00-00 00:00:00'";
$comments = "SELECT * FROM comments WHERE topic_id IN($topics)";