...n set (0.00 sec) 检索所有的叶子节点 我们可以通过左连接(left-join)检索出所有的叶子节点(没有子节点的节点): SELECT t1.name FROM category AS t1 LEFT JOIN category as t2 ON t1.category_id = t2.parent WHERE t2.category_id IS NULL; +------...
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