made changes in task 3, added WHERE with IN

dmedvedev/filtering.sql

@@ -21,7 +21,7 @@ WHERE price < 100 OR price > 1000;
 --Задача 3 — Категории для рекламы
 SELECT id, name, category, price
 FROM products
-WHERE (category = 'tablet' OR category = 'smartphone' OR category = 'mouse') AND price < 1000
+WHERE category IN ('tablet', 'smartphone', 'mouse') AND price < 1000
 ORDER BY price DESC;
 
 --TASK 4