+--------+---------+-----------+
| id | title | parent_id |
+--------+---------+-----------+
| 1 | Lvl-1 | null |
+--------+---------+-----------+
| 2 | Lvl-11 | 1 |
+--------+---------+-----------+
| 3 | Lvl-111 | 2 |
+--------+---------+-----------+
| 4 | Lvl-12 | 4 |
+--------+---------+-----------+
+--------+---------+-----------+
| id | tit
阅读背景：
如何在邻接列表模型中删除父级及其子级？
来源：互联网
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