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add leetcode problem-cn part1

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2022-03-27 20:37:52 +08:00
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<p><code>Views</code>&nbsp;表:</p>
<pre>
+---------------+---------+
| Column Name | Type |
+---------------+---------+
| article_id | int |
| author_id | int |
| viewer_id | int |
| view_date | date |
+---------------+---------+
此表无主键,因此可能会存在重复行。
此表的每一行都表示某人在某天浏览了某位作者的某篇文章。
请注意,同一人的 author_id 和 viewer_id 是相同的。
</pre>
<p>&nbsp;</p>
<p>请编写一条 SQL 查询以找出所有浏览过自己文章的作者,结果按照 id 升序排列。</p>
<p>查询结果的格式如下所示:</p>
<pre>
Views 表:
+------------+-----------+-----------+------------+
| article_id | author_id | viewer_id | view_date |
+------------+-----------+-----------+------------+
| 1 | 3 | 5 | 2019-08-01 |
| 1 | 3 | 6 | 2019-08-02 |
| 2 | 7 | 7 | 2019-08-01 |
| 2 | 7 | 6 | 2019-08-02 |
| 4 | 7 | 1 | 2019-07-22 |
| 3 | 4 | 4 | 2019-07-21 |
| 3 | 4 | 4 | 2019-07-21 |
+------------+-----------+-----------+------------+
结果表:
+------+
| id |
+------+
| 4 |
| 7 |
+------+
</pre>