--Задача 1757
SELECT product_id
FROM Products
WHERE low_fats = 'Y' AND recyclable = 'Y';

--Задача 584
SELECT name
FROM Customer
WHERE referee_id!= 2 OR referee_id IS NULL;

--Задача 595
SELECT name, population, area
FROM World
WHERE area >= 3000000
   OR population >= 25000000;

--Задача 1148 
SELECT DISTINCT author_id AS id
FROM Views
WHERE author_id = viewer_id
ORDER BY id; 

--Задача 1683 
SELECT tweet_id
FROM Tweets
WHERE CHAR_LENGTH(content) > 15;

--Задача 620
SELECT id, movie, description, rating
FROM Cinema
WHERE id % 2 = 1
  AND description != 'boring'
ORDER BY rating DESC;

--Задача 1667
SELECT
  user_id,
  CONCAT(
    UPPER(SUBSTR(name, 1, 1)),
    LOWER(SUBSTR(name, 2))
  ) AS name
FROM Users
ORDER BY user_id;