Решение по базовый SQL

ebelykh/postgresql/базовый SQL/Select.sql

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+--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;