From 7bc1be7dcc40c0466be557dde25321fe48ad701f Mon Sep 17 00:00:00 2001 From: Amit S Sahu Date: Tue, 22 Oct 2024 09:32:21 +0530 Subject: [PATCH] Create README - LeetHub --- 1148-article-views-i/README.md | 49 ++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 1148-article-views-i/README.md diff --git a/1148-article-views-i/README.md b/1148-article-views-i/README.md new file mode 100644 index 0000000..631394f --- /dev/null +++ b/1148-article-views-i/README.md @@ -0,0 +1,49 @@ +

1148. Article Views I

Easy

Table: Views

+ +
++---------------+---------+
+| Column Name   | Type    |
++---------------+---------+
+| article_id    | int     |
+| author_id     | int     |
+| viewer_id     | int     |
+| view_date     | date    |
++---------------+---------+
+There is no primary key (column with unique values) for this table, the table may have duplicate rows.
+Each row of this table indicates that some viewer viewed an article (written by some author) on some date. 
+Note that equal author_id and viewer_id indicate the same person.
+
+ +

 

+ +

Write a solution to find all the authors that viewed at least one of their own articles.

+ +

Return the result table sorted by id in ascending order.

+ +

The result format is in the following example.

+ +

 

+

Example 1:

+ +
+Input: 
+Views table:
++------------+-----------+-----------+------------+
+| 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 |
++------------+-----------+-----------+------------+
+Output: 
++------+
+| id   |
++------+
+| 4    |
+| 7    |
++------+
+