friendly-movies-streamed-last-month.sql

/*

Friendly Movies Streamed Last Month Problem

Description
LeetCode Problem 1495.

Table: TVProgram

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| program_date  | date    |
| content_id    | int     |
| channel       | varchar |
+---------------+---------+
(program_date, content_id) is the primary key for this table.
This table contains information of the programs on the TV.
content_id is the id of the program in some channel on the TV.
Table: Content

+------------------+---------+
| Column Name      | Type    |
+------------------+---------+
| content_id       | varchar |
| title            | varchar |
| Kids_content     | enum    |
| content_type     | varchar |
+------------------+---------+
content_id is the primary key for this table.
Kids_content is an enum that takes one of the values ('Y', 'N') where: 
'Y' means is content for kids otherwise 'N' is not content for kids.
content_type is the category of the content as movies, series, etc.
Write an SQL query to report the distinct titles of the kid-friendly movies streamed in June 2020.

Return the result table in any order.

The query result format is in the following example.

TVProgram table:
+--------------------+--------------+-------------+
| program_date       | content_id   | channel     |
+--------------------+--------------+-------------+
| 2020-06-10 08:00   | 1            | LC-Channel  |
| 2020-05-11 12:00   | 2            | LC-Channel  |
| 2020-05-12 12:00   | 3            | LC-Channel  |
| 2020-05-13 14:00   | 4            | Disney Ch   |
| 2020-06-18 14:00   | 4            | Disney Ch   |
| 2020-07-15 16:00   | 5            | Disney Ch   |
+--------------------+--------------+-------------+

Content table:
+------------+----------------+---------------+---------------+
| content_id | title          | Kids_content  | content_type  |
+------------+----------------+---------------+---------------+
| 1          | Leetcode Movie | N             | Movies        |
| 2          | Alg. for Kids  | Y             | Series        |
| 3          | Database Sols  | N             | Series        |
| 4          | Aladdin        | Y             | Movies        |
| 5          | Cinderella     | Y             | Movies        |
+------------+----------------+---------------+---------------+

Result table:
+--------------+
| title        |
+--------------+
| Aladdin      |
+--------------+
"Leetcode Movie" is not a content for kids.
"Alg. for Kids" is not a movie.
"Database Sols" is not a movie
"Alladin" is a movie, content for kids and was streamed in June 2020.
"Cinderella" was not streamed in June 2020.

*/


# V0

# V1
# https://circlecoder.com/friendly-movies-streamed-last-month/
select distinct title
from Content 
join TVProgram using(content_id)
where kids_content = 'Y' 
	and content_type = 'Movies' 
	and (month(program_date), year(program_date)) = (6, 2020)

# V2
# Time:  O(n)
# Space: O(n)
SELECT DISTINCT title
FROM content ctt
INNER JOIN TVProgram tv
ON ctt.content_id = tv.content_id
WHERE content_type = 'Movies'
AND Kids_content = 'Y'
AND program_date BETWEEN '2020-06-01' AND '2020-06-30';