add 1148

Author: fishercoder1534

README.md

@@ -851,6 +851,7 @@ _If you like this project, please leave me a star._ ★
 |1251|[Average Selling Price](https://leetcode.com/problems/average-selling-price//)|[Solution](../master/database/_1251.sql) | | Easy |
 |1179|[Reformat Department Table](https://leetcode.com/problems/reformat-department-table/)|[Solution](../master/database/_1179.sql) |  | Easy |
 |1173|[Immediate Food Delivery I](https://leetcode.com/problems/immediate-food-delivery-i/)|[Solution](../master/database/_1173.sql) |  | Easy |
+|1148|[Article Views I](https://leetcode.com/problems/article-views-i/)|[Solution](../master/database/_1148.sql) |  | Easy |
 |1069|[Product Sales Analysis II](https://leetcode.com/problems/product-sales-analysis-ii/)|[Solution](../master/database/_1069.sql) |  | Easy |
 |1068|[Product Sales Analysis I](https://leetcode.com/problems/product-sales-analysis-i/)|[Solution](../master/database/_1068.sql) | | Easy |
 |627|[Swap Salary](https://leetcode.com/problems/swap-salary/)|[Solution](../master/database/_627.sql) | | Easy |

database/_1148.sql

@@ -0,0 +1,44 @@
+--1148. Article Views I
+--
+--Table: Views
+--
+--+---------------+---------+
+--| Column Name   | Type    |
+--+---------------+---------+
+--| article_id    | int     |
+--| author_id     | int     |
+--| viewer_id     | int     |
+--| view_date     | date    |
+--+---------------+---------+
+--There is no primary key for this table, it 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 an SQL query to find all the authors that viewed at least one of their own articles, sorted in ascending order by their id.
+--
+--The query result format is in the following example:
+--
+--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 |
+--+------------+-----------+-----------+------------+
+--
+--Result table:
+--+------+
+--| id   |
+--+------+
+--| 4    |
+--| 7    |
+--+------+
+
+--# Write your MySQL query statement below
+select distinct(author_id) as id from Views where author_id = viewer_id order by id asc;