pmikhailov/postgresql/base_sql.sql

@@ -1,6 +1,6 @@
 CREATE TABLE users (
 	id int PRIMARY KEY, -- NOT NULL
-	"name" varchar(100) NOT NULL,
+	name varchar(100) NOT NULL,
 	age int,
 	email varchar(100),
 	country varchar(2),
@@ -10,7 +10,7 @@ CREATE TABLE users (
 	
 CREATE TABLE products (
 	id int PRIMARY KEY, 
-	"name" varchar(100) NOT NULL,
+	name varchar(100) NOT NULL,
 	category varchar(50),
 	price decimal(10,2) NOT NULL,
 	in_stock BOOLEAN -- или int, потому что или на складе или не на складе
@@ -78,3 +78,111 @@ INSERT INTO pmikhailov.order_items
 (6, 1, 1, 82000),
 (7, 3, 1, 9000),
 (8, 4, 2, 2800);
+
+SELECT id, name, country, created_at, email 
+FROM users 
+ORDER BY created_at DESC, name ASC;
+
+SELECT id, name, country
+FROM users
+WHERE country = 'US'
+ORDER BY name ASC;
+
+SELECT id, name, country
+FROM users
+WHERE country = 'UK'
+ORDER BY name ASC;
+
+SELECT id, name, email
+FROM users u 
+WHERE email IS NOT NULL 
+ORDER BY name ASC;
+
+SELECT DISTINCT lower(email)
+FROM users u
+WHERE email IS NOT null;
+
+SELECT id, name, created_at 
+FROM users
+WHERE created_at >= '2024-02-05 09:30:00.000 +0100'
+ORDER BY created_at DESC 
+LIMIT 2 OFFSET 1;
+
+
+/* Задача 1 */
+
+SELECT 
+	name, 
+	category, 
+	price,
+	price * 1.3 AS price_with_markup,
+	price * 1.5 AS price_with_vat
+FROM 
+	products p 
+WHERE 
+	in_stock IS TRUE 
+	AND price BETWEEN 100 AND 1300;
+
+
+/* Задача 2 */
+
+SELECT 
+	name,
+	price,
+	price * 0.85 AS price_with_discount 
+FROM 
+	products p 
+WHERE 
+	(price <= 100) OR (price >= 1000);
+
+
+/* Задача 3 */
+
+SELECT 
+	id, 
+	name, 
+	category, 
+	price
+FROM 
+	products p 
+WHERE 
+	category IN ('tablet', 'smartphone', 'mouse')
+	AND price >= 100;
+
+
+/* Задача 4 */
+
+SELECT 
+	name, 
+	category, 
+	price
+FROM	
+	products p
+WHERE name NOT ILIKE '%iPhone%';
+
+
+/* Задача 5 */
+
+SELECT 
+	name, 
+	category, 
+	price
+FROM 
+	products p 
+WHERE 
+	name NOT ILIKE '%pro%'
+ORDER BY 
+	price DESC;
+
+SELECT 
+	name, 
+	category, 
+	price
+FROM 
+	products p 
+WHERE 
+	name NOT ILIKE '%mx%';
+ORDER BY 
+	price DESC;
+	
+